How to Resize an Image Without Stretching It
Resize a photo to the dimensions you need, preserve its aspect ratio and choose an output format. See a worked pixel example and avoid common mistakes.
Read guideToolzHive Guides
Practical steps, worked examples and tools to help you finish the task.
Image Tools
JPG vs PNG: Which Format Should You Use?
Choose JPG or PNG for photos, screenshots and transparent graphics. Learn what conversion changes and why converting to PNG does not restore lost detail.
Read guideHow to Compress an Image for an Upload Limit
Reduce an image file for an upload limit using dimensions, output format and quality. Compare results without promising lossless JPG compression.
Read guideHow to Use Image Resizer
Resize images by width, height or percentage. Keep aspect ratio and download PNG, JPG or WebP images with this free browser-based image resizer.
Read guideHow to Use Image Converter
Convert images to PNG, JPG or WebP in your browser. Set JPG background color, adjust export quality and download a new image without uploading files.
Read guideHow to Use Image Compressor
Compress images to JPG or WebP in your browser. Adjust quality, limit width and compare file sizes before downloading your compressed image.
Read guideHow to Use Image Filters
Apply photo filters online: adjust brightness, contrast, saturation and blur or pick a preset look, then download the result. Free, no upload needed.
Read guideHow to Use Image Rotator & Flipper
Rotate images by 90 degrees and flip them horizontally or vertically online. Free image rotator and mirror tool that works in your browser, no upload.
Read guideHow to Use Image Pixelator
Pixelate images online to create retro pixel art or hide details. Choose the block size and download the result. Free image pixelator, files stay private.
Read guideHow to Use Image Color Picker
Pick colors from any image and copy their HEX, RGB and HSL codes. Free online image color picker that runs in your browser, your photo is never uploaded.
Read guideHow to Use Image to Base64
Convert images to Base64 data URIs online and get ready-to-paste CSS and HTML snippets. Free image to Base64 encoder that works in your browser.
Read guideHow to Use Image Cropper
Crop images to square, 16:9, 9:16 or custom proportions. Move the selection, adjust crop coordinates and download the result in your browser.
Read guideHow to Use Image Watermark
Add a text watermark to photos online. Set the position, size, color and opacity, then download your protected image. Free, no upload required.
Read guideHow to Use Favicon Generator
Generate PNG icons and a favicon.ico file from one source image. Adjust padding, rounded corners and background, then download your website icons.
Read guideHow to Use SVG to PNG Converter
Convert SVG to PNG online at any size or scale. Paste SVG code or upload a file and download a crisp, transparent PNG. Free converter, runs in your browser.
Read guideHow to Use Image Rounded Corners
Round the corners of any image or turn it into a circle online, with an optional border. Download a transparent PNG. Free tool, no upload or sign-up.
Read guideHow to Use Base64 to Image
Decode a Base64 string or data URI back into an image. Preview it instantly and download it in its original format. Free online Base64 to image converter.
Read guideHow to Use Photo Censor
Censor photos online by pixelating, blurring or blacking out faces, license plates and private details. Free photo censor tool, your image stays on your device.
Read guideHow to Use Image Average Color Finder
Find the average and dominant color of any image and copy its HEX and RGB values. Free online tool for designers, runs in your browser without uploads.
Read guideHow to Use Image Color Extractor
Extract a color palette from any image with the share of each color. Copy HEX codes for your designs. Free online image color extractor, no upload.
Read guideHow to Use SVG Blob Generator
Generate random organic SVG blob shapes for backgrounds and illustrations. Adjust complexity, randomness and color, then copy the SVG or download it free.
Read guideHow to Use SVG Pattern Generator
Create seamless SVG background patterns with custom shapes, sizes and colors. Copy the SVG or the CSS background snippet. Free SVG pattern generator.
Read guideHow to Use Background Remover
Remove plain or solid-color backgrounds from images online and download a transparent PNG. Free background remover that works in your browser.
Read guideHow to Use Avatar Generator
Create unique avatars from any name: cartoon, initials, pixel and abstract styles. The same name always gives the same avatar. Download as SVG or PNG free.
Read guideHow to Use Random Human Picture Generator
Generate realistic AI photos of people who do not exist for mockups, placeholders and testing. Pick a size and format and download it. Free, no sign-up.
Read guideHow to Use Number Plate Maker
Design a vehicle number plate online. Choose a style preset or custom colors, add your plate number and region, and download it as PNG or JPG. Free.
Read guideHow to Use Dummy Image Generator
Create placeholder images of any size, color and text and download them as PNG, JPG, WEBP or SVG, with presets for social, ad and avatar sizes.
Read guideHome Calculators
How Much Concrete Do You Need for a Slab?
Calculate a rectangular slab’s concrete volume in cubic feet, cubic yards or cubic meters, with a worked example and clear bag-yield assumptions.
Read guideHow to Calculate Square Footage of a Room
Calculate floor area from room dimensions, split irregular rooms into rectangles and keep material allowances separate from measured square footage.
Read guideHow to Use Concrete Calculator
Calculate the concrete needed for slabs, footings, round columns and steps in cubic yards or cubic meters, plus the premix bags to buy, with waste.
Read guideHow to Use Cement Calculator
Work out cement bags, sand, aggregate and water for a concrete volume and mix ratio such as 1:1.5:3 (M20) or 1:2:4 (M15), from dimensions or volume.
Read guideHow to Use Concrete Block Calculator
Estimate the concrete blocks (CMU) and mortar bags needed for a wall from its length and height, minus openings, for US and metric block sizes.
Read guideHow to Use Brick Calculator
Estimate how many bricks and how much mortar a wall needs for US, UK, Pakistani and metric brick sizes, single or double thickness, with waste.
Read guideHow to Use Gravel Calculator
Calculate how much gravel you need for a driveway, path or base in cubic yards, tons, cubic meters and bags, from the area and depth, plus cost.
Read guideHow to Use Sand Calculator
Calculate the sand you need for pavers, sandboxes and bases in cubic yards, cubic meters, tons and bags from the area and depth, with waste and cost.
Read guideHow to Use Mulch Calculator
Find how much mulch you need for garden beds in cubic yards, cubic meters and 2 or 3 cubic foot bags, from the bed size and depth, with cost.
Read guideHow to Use Topsoil Calculator
Calculate the topsoil needed to level a lawn or fill raised beds in cubic yards, cubic meters, tons and bags from the area and depth, with cost.
Read guideHow to Use Asphalt Calculator
Estimate how many tons of asphalt you need for a driveway or parking area from its size and compacted thickness, with volume and total cost.
Read guideHow to Use Cubic Yard Calculator
Convert length, width and depth into cubic yards, cubic feet, cubic meters and liters for soil, mulch, gravel and concrete orders, with total cost.
Read guideHow to Use Cubic Feet Calculator
Calculate cubic feet for boxes, rooms and cylinders from dimensions in inches, feet, yards, centimeters or meters, with liters and gallons.
Read guideHow to Use Square Feet Calculator
Calculate square footage for rectangular, square, circular, triangular and L-shaped rooms from any units, with square meters, acres and cost.
Read guideHow to Use Acre Calculator
Calculate the acreage of a plot from its length and width, or convert land area between acres, hectares, square feet, kanal, marla and more.
Read guideHow to Use Drywall Calculator
Estimate drywall sheets for walls and ceilings, minus doors and windows, plus screws, joint compound and tape, with 4×8, 4×10 or 4×12 sheets.
Read guideHow to Use Plywood Calculator
Calculate the number of plywood sheets needed to cover a floor, wall or roof from its length and width, with sheet size, waste and total cost.
Read guideHow to Use Tile Calculator
Find how many tiles and boxes you need for a floor or wall from the room size, tile size and grout gap, with waste for cuts and total cost.
Read guideHow to Use Sod Calculator
Estimate the sod rolls or pallets needed to cover a lawn from its length and width, with roll size, waste and total cost per square foot.
Read guideHow to Use Siding Calculator
Estimate the siding needed for a house in squares from wall and gable areas, minus doors and windows, with waste and cost per square.
Read guideHow to Use Paint Calculator
Work out how many gallons or liters of paint a room needs from the wall size, doors, windows, ceiling and number of coats, and which cans to buy.
Read guideHow to Use Roofing Calculator
Calculate roof area, pitch factor, roofing squares, shingle bundles, underlayment rolls and nails from the house size, overhang and roof pitch.
Read guideHow to Use Wallpaper Calculator
Find how many rolls of wallpaper you need from the wall length and height, roll size and pattern repeat, minus doors and windows, with waste.
Read guideHow to Use Stud Calculator
Calculate how many wall studs and plates you need for a wall from its length and stud spacing, with extra studs for corners and openings.
Read guideHow to Use Board Foot Calculator
Calculate board feet and lumber cost from board thickness, width and length and the number of boards, with cubic feet and cubic meters.
Read guideHow to Use Water Tank Capacity Calculator
Calculate the capacity of rectangular, vertical and horizontal cylindrical tanks in liters and gallons, and how much water is in the tank now.
Read guideHow to Use Rug Size Calculator
Find the right rug size for your living room, bedroom or dining room from the room and table size, with the nearest standard size in feet and cm.
Read guideHow to Use Curtain Size Calculator
Calculate curtain length, rod width, fabric width and the number of panels for your window, fullness and style: sill, apron, floor or puddle length.
Read guideHow to Use Ceiling Fan Size Calculator
Find the right ceiling fan blade span for a room’s size and the downrod length for your ceiling height, with clearance and placement tips.
Read guideHow to Use TV Size Calculator
Find the best TV size for your viewing distance using THX and SMPTE guidelines, or work out the width and height of any screen size and ratio.
Read guideHow to Use Picture Mat Size Calculator
Calculate the mat opening and outer mat or frame size for artwork with even or bottom-weighted borders, and find the nearest standard frame size.
Read guideHow to Use Tire Size Calculator
Decode tire sizes like 225/45R17 into diameter, sidewall and circumference, and compare two sizes to see the speedometer difference.
Read guideCoding Tools
How to Format and Validate JSON
Format JSON for reading, fix common syntax errors and understand what validation can check. Includes a valid example and cautions about numeric precision.
Read guideHow to Use JSON Formatter & Validator
Format and validate JSON online with 2-space, 4-space or tab indentation. Sort object keys, minify JSON and copy the result for free.
Read guideHow to Use UUID Generator
Generate random UUID v4 identifiers in your browser. Create up to 1,000 IDs, choose uppercase, hyphens or braces, and copy the full list.
Read guideHow to Use JWT Decoder
Decode JSON Web Tokens online. Inspect the JWT header, payload and claims, in a readable format. Free JWT decoder that runs locally in your browser.
Read guideHow to Use Serialize & Unserialize
Unserialize PHP data into print_r, var_dump, var_export, JSON or tree views, turn JSON into PHP serialize format, and repair broken string lengths.
Read guideHow to Use Regex Tester
Test JavaScript regular expressions online with live match highlighting and flags. See every match in your sample text. Free regex tester for developers.
Read guideHow to Use JSON to CSV Converter
Convert JSON to CSV online. Turn a JSON array of objects into spreadsheet-ready CSV or TSV and download it. Free JSON to CSV converter, no upload.
Read guideHow to Use CSV to JSON Converter
Convert CSV or TSV to JSON online with header rows and automatic number and boolean detection. Copy or download the JSON. Free converter, no upload.
Read guideHow to Use JSON to YAML Converter
Convert JSON to YAML online instantly. Paste valid JSON and get clean, readable YAML for configs, Docker and Kubernetes files. Free converter.
Read guideHow to Use SQL Formatter
Format SQL queries online with clean indentation and optional uppercase keywords. Free SQL formatter and beautifier for readable, reviewable queries.
Read guideHow to Use XML Formatter
Format and beautify XML online with proper indentation, or minify it to a compact version. Validates your XML as it parses. Free online XML formatter.
Read guideHow to Use Online REST API Client
Send GET, POST, PUT, PATCH and DELETE requests online with params, headers, auth and JSON bodies. Inspect responses and copy cURL, fetch or Python code.
Read guideHow to Use URL Parser
Parse any URL into its parts: protocol, host, port, path, hash and query parameters in a readable table. Free online URL parser for developers and SEO.
Read guideHow to Use Code to Image Converter
Turn code snippets into beautiful images with syntax highlighting, themes and window styles. Download a PNG for docs, slides or social posts. Free tool.
Read guideHow to Use JSON Tree Viewer
View JSON as an interactive, collapsible tree. Explore nested values, types and paths and copy any path. Free online JSON viewer that runs in your browser.
Read guideHow to Use JavaScript Formatter
Beautify JavaScript online by adding readable indentation and line breaks to minified or messy code. Free JavaScript formatter, copy the result.
Read guideHow to Use JavaScript Minifier
Minify JavaScript online by removing comments and extra whitespace to reduce file size. Free JS minifier that runs in your browser. Copy the output.
Read guideHow to Use JWT Encoder & Signer
Create and sign JSON Web Tokens online with HS256, HS384 or HS512. Enter a JSON payload and secret to get a signed JWT. Free JWT generator for testing.
Read guideHow to Use React Native Shadow Generator
Generate React Native shadow styles for iOS and Android elevation from one set of controls. Preview live and copy the style object. Free online tool.
Read guideMath Calculators
How to Multiply Two- and Three-Digit Numbers
Work through multiplication using partial products, check two- and three-digit examples, and handle decimal places and negative signs.
Read guideHow to Use Addition Calculator
Add two or more numbers of any size exactly, including decimals and negative numbers, with no rounding errors. Free online addition calculator.
Read guideHow to Use Subtraction Calculator
Subtract one number from another exactly, including decimals, negatives and very large numbers, and see the difference and absolute difference. Free.
Read guideHow to Use Multiplication Calculator
Multiply whole numbers, decimals and negative values online. Check the product and scientific notation, with worked examples for two- and three-digit numbers.
Read guideHow to Use Division Calculator
Divide numbers and see the exact decimal with repeating digits marked, the simplified fraction, the remainder and a rounded result. Free division calculator.
Read guideHow to Use Percentage Calculator
Calculate percentages online: what is X% of Y, X as a percent of Y, and percentage increase or decrease between two values. Free percentage calculator.
Read guideHow to Use Square Calculator
Find the square of any number exactly, including decimals and negative numbers, plus its cube and scientific notation. Free online square calculator.
Read guideHow to Use Square Root Calculator
Calculate the square root of any number to up to 50 decimal places, check if it is a perfect square and see the simplified radical form. Free calculator.
Read guideHow to Use Scientific Calculator
A free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, memory and history, in degrees, radians or grads.
Read guideHow to Use Graphing Calculator
Plot up to five functions like sin(x), x^2 or 2x + 1 on an interactive graph. Zoom, pan and trace values by hovering over the curves.
Read guideHow to Use Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, and get the simplified fraction, mixed number, decimal and percent with the steps shown.
Read guideHow to Use Ratio Calculator
Simplify ratios like 12:18:30 to their simplest form, see each part as a share of the total, or solve A:B = C:D for the missing value.
Read guideHow to Use Proportion Calculator
Solve proportions of the form A/B = C/D for any one missing value using cross-multiplication, or check whether two ratios are equal.
Read guideHow to Use LCM Calculator
Find the least common multiple (LCM) of two or more whole numbers, with the prime factorization of each number and their greatest common factor.
Read guideHow to Use GCF & HCF Calculator
Find the greatest common factor (GCF), also called the highest common factor (HCF) or GCD, of two or more numbers, with prime factors and the LCM.
Read guideHow to Use Factor Calculator
List every factor and factor pair of a whole number, see its prime factorization and sum of factors, and find out whether it is prime or a perfect square.
Read guideHow to Use Slope Calculator
Find the slope between two points, plus the line equation y = mx + b, angle, grade, distance, midpoint and perpendicular slope, step by step.
Read guideHow to Use Distance Calculator
Calculate the distance between two points on a plane or in 3D, or the great-circle distance between two latitude and longitude points on Earth.
Read guideHow to Use Statistics Calculator
Get the mean, median, mode, range, quartiles, IQR, variance, standard deviation, geometric mean, skewness and more from any list of numbers.
Read guideHow to Use Standard Deviation Calculator
Calculate the sample or population standard deviation and variance of a data set, with the mean, standard error and a step-by-step table.
Read guideHow to Use Mean, Median & Mode Calculator
Find the mean, median, mode and range of a list of numbers, with a plain explanation of how each average is worked out from your data.
Read guideHow to Use Area Calculator
Calculate the area and perimeter of squares, rectangles, triangles, circles, ellipses, trapezoids, rhombuses, sectors and regular polygons in any unit.
Read guideHow to Use Volume Calculator
Calculate the volume of cubes, boxes, cylinders, spheres, hemispheres, cones, pyramids, prisms, capsules and ellipsoids in liters, gallons and cubic units.
Read guideHow to Use Grade Calculator
Calculate your weighted average grade from assignments, tests and projects with their weights, and see the letter grade and GPA points it earns.
Read guideHow to Use GPA Calculator
Calculate your semester and cumulative GPA on the 4.0 scale from letter grades and credit hours, including your previous GPA and completed credits.
Read guideHow to Use Final Grade Calculator
Find the score you need on your final exam to reach your target course grade, based on your current grade and how much the final is worth.
Read guideHow to Use CGPA to Percentage Calculator
Convert CGPA to percentage and percentage to CGPA on 10-point, 4-point and 5-point scales, including the common CBSE formula of CGPA × 9.5.
Read guideHow to Use Molecular Weight Calculator
Calculate the molar mass of any chemical formula, including brackets and hydrates, with a breakdown by element and a grams-to-moles converter.
Read guideText Tools
How to Use Case Converter
Change text to uppercase, lowercase, sentence case or title case. Convert names to camelCase, snake_case and more, then copy or download the result.
Read guideHow to Use Word & Character Counter
Count words, characters, sentences and paragraphs as you type. Check estimated reading and speaking time with this free online word counter.
Read guideHow to Use Language Translator
Translate typed text between the languages offered in the From and To menus, with optional source-language detection.
Read guideHow to Use Text Diff Checker
Compare two texts online and see exactly what changed. This free diff checker highlights added, removed and unchanged lines, all right in your browser.
Read guideHow to Use Find and Replace
Find and replace text online for free. Swap words or regex matches across any block of text, with case-sensitive and whole-word options. No sign-up.
Read guideHow to Use Plagiarism Checker
Compare your writing with pasted source text, highlight shared phrases and download a matched-word report. Private browser processing; no web scan.
Read guideHow to Use Line Sorter
Sort lines online alphabetically, numerically or by length, reverse them or shuffle them. Free line sorter for lists, keywords and data. Nothing uploaded.
Read guideHow to Use Duplicate Line Remover
Remove duplicate lines from any list online while keeping the original order. Free tool for cleaning emails, keywords and data exports in your browser.
Read guideHow to Use Whitespace Remover
Remove extra spaces, tabs, line breaks and empty lines from text online. Free whitespace cleaner with separate controls for each fix. Works in your browser.
Read guideHow to Use Text Reverser
Reverse text online: flip the character order, word order or line order, or reverse each word. Free text reverser for puzzles, fun and testing. No sign-up.
Read guideHow to Use Slug Generator
Turn titles into clean, SEO-friendly URL slugs. Free slug generator that lowercases text, strips accents and symbols, and handles many titles at once.
Read guideHow to Use Upside Down Text
Flip text upside down with Unicode characters you can paste anywhere: social bios, chats and usernames. Free upside-down text generator, copy in one click.
Read guideHow to Use Bionic Reading Converter
Convert text to bionic reading format by bolding the first letters of each word to help your eyes move faster. Free online converter, copy the result.
Read guideHow to Use Text Repeater
Repeat text or emoji hundreds of times with a custom separator such as a space, comma or new line. Free online text repeater, copy the result instantly.
Read guideHow to Use Add Prefix, Suffix & Line Numbers
Add line numbers to text or put a prefix and suffix on every line of a list. Free online tool for code, lists and data. Copy the result in one click.
Read guideHow to Use Zalgo Glitch Text Generator
Create creepy Zalgo glitch text with combining marks above, through and below letters. Free cursed text generator, choose the intensity and copy it.
Read guideHow to Use Text to Speech
Free online text to speech. Read any text aloud with the voices on your device and adjust the speed and pitch. No download, no sign-up, works in your browser.
Read guideHow to Use Text to Handwriting Converter
Convert typed text to realistic handwriting on lined paper, choose the font, ink and paper, and download it as an image. Free text to handwriting converter.
Read guideHow to Use Text Compare
Compare two texts or files side by side like Beyond Compare, with word or character highlights, whitespace options and jump-to-next-difference navigation.
Read guideHow to Use Spell Checker
Check your text for spelling, grammar and punctuation mistakes in English and 13 other languages, and fix each one with a single click on a suggestion.
Read guideHow to Use Small Text Generator
Turn text into tiny superscript, subscript and small caps letters you can copy and paste into bios, usernames, posts and messages anywhere.
Read guideHow to Use Invisible Character Generator
Copy invisible and blank Unicode characters such as Hangul Filler and zero-width space for empty names and messages, or find hidden characters in text.
Read guideHow to Use Email & URL Extractor
Extract every email address and URL from text, HTML or documents. Remove duplicates, filter by domain, sort and copy the results. Free email extractor.
Read guideHow to Use Runic Translator
Translate English text into Elder Futhark, Younger Futhark or Anglo-Saxon runes and back, with a rune alphabet chart. Copy the runes for tattoos and art.
Read guideHow to Use Minecraft Color Codes
Format Minecraft chat, sign and server MOTD text with & and § color and style codes. See a live in-game preview and copy the ready code.
Read guideHTML Tools
How to Use HTML Entity Encoder / Decoder
Encode text to HTML entities or decode entities back to readable characters. Free online HTML entity encoder and decoder for safe markup and escaping.
Read guideHow to Use HTML Table Generator
Create an HTML table in a spreadsheet-like editor: set rows and columns, add a header and caption, paste from Excel and copy clean table code. Free.
Read guideHow to Use CSV to HTML Table
Convert CSV, TSV or spreadsheet data into a clean HTML table with a header row, basic styles and right-aligned numbers. Copy or download. Free converter.
Read guideHow to Use HTML List Generator
Turn lines of text into bulleted (ul) or numbered (ol) HTML lists, with nested sub-lists, numbering styles, start numbers and a live preview. Free.
Read guideHow to Use URLs to HTML Links
Convert plain URLs into clickable HTML links, lists or linked text, with new-tab, nofollow and duplicate removal options. Free URL to hyperlink converter.
Read guideHow to Use Mailto Link Generator
Create a mailto email link with subject, message, CC and BCC, encoded correctly, and optionally hidden from spam bots. Copy the HTML or URL. Free generator.
Read guideHow to Use Popup Window Generator
Generate HTML and JavaScript for a link that opens a popup window with a set size, position and features, centered on screen if you like. Free generator.
Read guideHow to Use HTML Minifier
Minify HTML online: remove comments, extra whitespace and optional attribute quotes to shrink page size. Free HTML minifier, copy the compressed code.
Read guideHow to Use HTML Viewer
Write or paste HTML, CSS and JavaScript and see a live rendered preview with console output. Open .html files, test mobile widths and download the page.
Read guideHow to Use HTML Formatter
Format and beautify HTML online with clean indentation. Choose the indent size and how inline tags are handled, then copy the code. Free HTML formatter.
Read guideHow to Use Word to HTML Converter
Paste from Microsoft Word, Google Docs or a web page and get clean, semantic HTML without styles, spans or Office junk. Free Word to HTML converter.
Read guidePDF Tools
How to Use PDF Merger
Combine multiple PDF files into one document in your browser. Reorder files before merging and download the combined PDF without uploading documents.
Read guideHow to Use PDF Editor
Edit PDF files online for free: add text, drawings, highlights, shapes, images and signatures, or white out content. Works in your browser, no upload.
Read guideHow to Use PDF Splitter
Split a PDF into page ranges, groups of N pages or one file per page. Extract the pages you need and download PDFs processed in your browser.
Read guideHow to Use Chat with PDF
Chat with your PDF for free. Ask questions, get summaries and find key facts, dates and figures in any document with AI. Answers cite the page number.
Read guideHow to Use Image to PDF
Combine JPG, PNG and other browser-readable images into one PDF. Choose A4, Letter or image-sized pages, set margins and download without uploading files.
Read guideHow to Use PDF Compressor
Compress PDF files online for free. Reduce file size for email and uploads with four quality levels, right in your browser. Your PDF is never uploaded.
Read guideHow to Use PDF to Image
Convert PDF pages to JPG or PNG images in your browser. Choose an output scale and download individual pages or every page as separate image files.
Read guideHow to Use PDF Watermark
Add a text or image watermark to PDF pages online. Set the position, size, opacity and angle, tile it across pages and choose which pages. Free, no upload.
Read guideHow to Use PDF Page Organizer
Reorder, rotate and delete PDF pages online using page thumbnails, then download the new PDF. Free PDF organizer that keeps your files on your device.
Read guideHow to Use PDF to Word
Convert a PDF to an editable Word document (.docx) in your browser. Headings, paragraphs and bold text are rebuilt from the PDF text, with no upload.
Read guideHow to Use Word to PDF
Convert Word (.docx) documents to PDF in your browser, keeping headings, bold and italic text, colors, lists, tables and images, without uploading the file.
Read guideHow to Use PDF to Excel
Convert PDF tables and text rows into an Excel spreadsheet (.xlsx) or CSV. Columns are detected from text positions and numbers stay numbers.
Read guideHow to Use PDF to PowerPoint
Convert every page of a PDF into a slide in a PowerPoint (.pptx) presentation that looks exactly like the original, right in your browser.
Read guideHow to Use PDF to Text
Extract all the text from a PDF, keeping lines and columns readable, then copy it or download it as a .txt file. Works in your browser, no upload.
Read guideHow to Use Text to PDF
Turn plain text into a clean PDF with your choice of font, size, page size, orientation, margins and line spacing, plus optional page numbers.
Read guideHow to Use Add Page Numbers to PDF
Add page numbers to a PDF with your choice of position, format (1, Page 1 of 10…), font, size, color and starting number, and skip cover pages.
Read guideHow to Use Delete Pages from PDF
Remove unwanted pages from a PDF by clicking page thumbnails or typing page ranges, then download a new copy. Runs in your browser with no upload.
Read guideHow to Use Crop PDF
Crop the margins of every PDF page by millimeters, points or inches, or trim white space automatically, with a live preview of the area that stays.
Read guideHow to Use PDF Password Protector
Add a password to a PDF with AES 128-bit encryption so it cannot be opened without it. Set print, copy and edit permissions, all in your browser.
Read guideHow to Use PDF Password Remover
Unlock a password-protected PDF you know the password for, or remove print and copy restrictions, and save an unlocked copy. Runs in your browser.
Read guideCSS Tools
How to Use CSS Gradient Generator
Create CSS gradients visually: linear, radial or conic, with editable color stops and angles. Copy the ready-to-use CSS. Free online gradient generator.
Read guideHow to Use CSS Box Shadow Generator
Design CSS box shadows with live preview. Adjust offset, blur, spread, color and opacity, add inset shadows and copy the CSS code. Free generator.
Read guideHow to Use CSS Border Radius Generator
Generate CSS border-radius code visually. Set each corner in pixels or percent, preview the shape live and copy the CSS. Free border radius generator.
Read guideHow to Use CSS Glassmorphism Generator
Create glassmorphism CSS: frosted, translucent cards with backdrop blur, saturation and borders. Preview live and copy the code. Free online generator.
Read guideHow to Use CSS Text Shadow Generator
Generate CSS text shadows and glow effects with a live preview. Adjust offset, blur and color, then copy the CSS code. Free text shadow generator.
Read guideHow to Use CSS Triangle Generator
Generate pure CSS triangles using borders. Pick the direction, size and color, preview it live and copy the code. Free online CSS triangle generator.
Read guideHow to Use CSS Cubic Bezier Generator
Design CSS easing curves with a visual cubic-bezier editor, compare the motion with linear timing and copy the transition code. Free online tool.
Read guideHow to Use CSS Clip Path Generator
Create CSS clip-path shapes visually: polygons, circles, ellipses and insets. Edit the values, preview the shape live and copy the CSS. Free generator.
Read guideHow to Use CSS Loader Generator
Generate pure CSS loading spinners and animations. Customize size, color and speed, then copy the HTML and CSS. Free online CSS loader generator.
Read guideHow to Use CSS Flexbox Generator
Learn and build CSS flexbox layouts visually. Set direction, alignment, wrapping and gaps on live items and copy the CSS. Free flexbox generator.
Read guideHow to Use CSS Grid Generator
Build CSS grid layouts visually. Set rows, columns and gaps, preview the grid live and copy the CSS and HTML. Free online CSS grid generator.
Read guideHow to Use CSS Minifier & Beautifier
Minify CSS online to reduce file size, or beautify it for easier reading. Free CSS minifier and formatter that runs in your browser. Copy in one click.
Read guideHow to Use CSS Transform Generator
Generate CSS transforms: rotate, scale, skew, translate and 3D rotation with a live preview. Copy the transform code instantly. Free online tool.
Read guideHow to Use CSS Unit Converter
Convert CSS units: px to rem, em, pt, vw, vh and percent, using your own root font size and viewport. Free online CSS unit converter, copy the value.
Read guideHow to Use CSS Checkbox Generator
Design custom CSS checkboxes with your own size, colors, radius and check style. Preview live and copy the HTML and CSS. Free checkbox generator.
Read guideHow to Use CSS Switch Generator
Generate CSS toggle switches with custom size, colors and animation. Preview the switch live and copy the HTML and CSS code. Free online generator.
Read guideHow to Use CSS Background Pattern Generator
Create CSS background patterns such as stripes, dots, grids and checks without images. Customize colors and size, then copy the CSS. Free tool.
Read guideHow to Use CSS Text Glitch Effect Generator
Generate an animated CSS glitch text effect for headings and hero sections. Customize colors and speed, then copy the HTML and CSS. Free online tool.
Read guideHow to Use Google Fonts Pair Finder
Find Google Fonts pairings that work together. Preview heading and body font combinations with your own text and copy the CSS. Free font pair finder.
Read guideColor Tools
How to Use Color Converter
Convert colors between HEX, RGB, HSL and CMYK instantly. Pick or paste any color and copy the value you need. Free online color converter for designers.
Read guideHow to Use Color Shades Generator
Generate tints and shades of any color, from lightest to darkest. Copy HEX codes for your palette or design system. Free online color shades generator.
Read guideHow to Use Color Palette Generator
Generate color palettes from one base color using harmonies like complementary, triadic and analogous. Copy HEX codes. Free palette generator.
Read guideHow to Use Contrast Checker
Check color contrast for accessibility. Test text and background colors against WCAG AA and AAA ratios and see a live preview. Free contrast checker.
Read guideHow to Use Color Mixer
Mix two colors online at any ratio and see the blended result with all the steps in between. Copy HEX and RGB values. Free online color mixer.
Read guideHow to Use HEX to RGBA Converter
Convert HEX colors to RGBA with custom opacity. Get RGBA, 8-digit HEX with alpha and ready-to-use CSS values. Free online HEX to RGBA converter.
Read guideHow to Use Random Color Generator
Generate random colors and palettes, lock the swatches you like and shuffle the rest. Copy HEX codes in one click. Free random color generator.
Read guideHow to Use Color Blindness Simulator
Simulate color blindness on any image: protanopia, deuteranopia, tritanopia and more. Check how your design looks to everyone. Free, no upload.
Read guideHow to Use CSS Named Colors
Browse all CSS named colors with their HEX and RGB values. Search by name or color and copy the code in one click. Free CSS color names reference.
Read guideHow to Use Color Inverter
Invert any color and see its complementary and grayscale versions. Copy the HEX and RGB values for your design. Free online color inverter.
Read guideHow to Use RGBA to HEX Converter
Convert RGBA colors to HEX, with alpha as 8-digit HEX, without alpha, or flattened over a background color. Free online RGBA to HEX converter.
Read guideHow to Use Color Tone Generator
Generate tints, shades and tones from any HEX, RGB, HSL, HSV or CMYK color, see every format of the color and click any swatch to copy its HEX code.
Read guideData Generators
How to Use Random Number Generator
Generate random numbers between any minimum and maximum, one or many at a time, with or without repeats. Free online random number generator.
Read guideHow to Use Lorem Ipsum Generator
Free Lorem Ipsum generator. Create placeholder text by paragraphs, sentences or words for mockups and layouts, with optional HTML tags. Copy in one click.
Read guideHow to Use List Randomizer
Shuffle a list into random order or pick random winners from it. Paste names or items, one per line. Free online list randomizer and random picker.
Read guideHow to Use Random Name Generator
Generate random first, last or full names by gender and origin, from English to Arabic, Japanese and more. Copy any name or download the whole list free.
Read guideHow to Use Fake Identity Generator
Generate fake identities for testing: names, addresses, phone numbers, emails and profile details by country. Free fictional data for mockups and QA.
Read guideHow to Use Mock Data Generator
Generate realistic fake test data with 30+ field types and export up to 1,000 rows as JSON, CSV, SQL inserts or XML. Free mock data generator.
Read guideHow to Use Real Content Generator
Generate readable English placeholder text on real topics like business, technology and travel instead of lorem ipsum, with optional headings and HTML.
Read guideHow to Use Email Address Generator
Generate random test email addresses on safe example domains, your own domain or popular providers, in different username styles. Copy or export CSV.
Read guideHow to Use Test Card Number Generator
Generate Luhn-valid test card numbers for Visa, Mastercard, Amex and more to test payment form validation, and check any number with the Luhn algorithm.
Read guideHow to Use Test IBAN Generator
Generate fake IBAN numbers for software testing, by country, with valid structure and check digits. Validate IBAN formats too. Free test data generator.
Read guideUnit & Number Converters
How to Use Length Converter
Convert length and distance between meters, feet, inches, centimeters, kilometers, miles, yards and more, with a quick reference table. Free length converter.
Read guideHow to Use Weight Converter
Convert weight and mass between kilograms, pounds, grams, ounces, stones, tons and carats instantly, with a reference table. Free kg to lbs converter.
Read guideHow to Use Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine instantly, with the formula and a reference table. Free temperature converter.
Read guideHow to Use Area Converter
Convert area between square meters, square feet, acres, hectares, square kilometers, marla and kanal. Free area and land size converter with reference table.
Read guideHow to Use Volume Converter
Convert volume between liters, milliliters, US and UK gallons, cups, fluid ounces, teaspoons and cubic meters instantly. Free volume converter.
Read guideHow to Use Speed Converter
Convert speed between kilometers per hour, miles per hour, meters per second, knots, feet per second and Mach instantly. Free speed converter.
Read guideHow to Use Time Converter
Convert time between seconds, minutes, hours, days, weeks, months, years, decades and milliseconds instantly. Free time unit converter.
Read guideHow to Use Data Storage Converter
Convert data sizes between bits, bytes, KB, MB, GB, TB and PB, and binary units like KiB, MiB and GiB. Understand why drives look smaller. Free converter.
Read guideHow to Use Text to Binary Converter
Convert text to binary, hex, octal or decimal codes and decode them back to readable text. Free online text-to-binary translator that runs in your browser.
Read guideHow to Use Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers, with a step-by-step breakdown. Free online Roman numeral converter.
Read guideHow to Use Number to Words
Convert numbers to words in English, including a cheque-style amount format for writing checks. Copy the result in one click. Free number to words tool.
Read guideHow to Use Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any custom base from 2 to 36. Free online number base converter for developers.
Read guideDate & Time Tools
How to Use Stopwatch
Free online stopwatch with lap times. Start, pause and reset with one click or the keyboard, and record split intervals. Works in any browser.
Read guideHow to Use Countdown Timer
Set an online countdown timer for any duration, with an optional alarm sound when time is up. Free timer for cooking, workouts, study and meetings.
Read guideHow to Use Age Calculator
Calculate your exact age in years, months and days from your date of birth, or the age on any chosen date. Free online age calculator.
Read guideHow to Use Date Calculator (Add & Subtract)
Add or subtract days, weeks, months and years from any date, or count business days only. See the result date, weekday, week number and day of year.
Read guideHow to Use Localized Date Formats
See how a date and time are written in 30+ countries and languages, plus ISO 8601, RFC 2822, Unix and common numeric formats. Click any format to copy it.
Read guideHow to Use Unix Timestamp Converter
Convert Unix timestamps to readable dates and dates back to epoch time, in seconds or milliseconds. Free online Unix timestamp converter for developers.
Read guideHow to Use Current Time Now
See the exact current time, date, time zone, UTC offset, ISO week and Unix timestamp, plus the time now in 18 major cities around the world.
Read guideHow to Use Festival & Holiday Dates
Find the dates of Eid, Ramadan, Diwali, Holi, Easter, Chinese New Year, Hanukkah, Thanksgiving, Christmas and other festivals for any year.
Read guideHow to Use Week Number Calculator
Find the ISO week number of any date, the US week number and day of the year, or look up the Monday-to-Sunday dates of any week in any year.
Read guideHow to Use Date Difference Calculator
Calculate the difference between two dates in days, weeks and more. Find how long until or since any date. Free date difference calculator.
Read guideHow to Use Time Calculator
Add or subtract days, hours, minutes and seconds, or add a duration to a clock time to find when something ends, including past midnight.
Read guideHow to Use Hours Calculator
Calculate the hours and minutes between two times or two dates and times, minus unpaid breaks, with decimal hours and optional pay at an hourly rate.
Read guideHow to Use Time Card Calculator
Add up weekly work hours from daily start, end and break times, split regular and overtime hours, and calculate pay with time-and-a-half.
Read guideHow to Use Time Zone Converter
Convert a date and time between world time zones and compare several cities at once. Plan calls and meetings across time zones. Free converter.
Read guideHow to Use Birthday Calculator
Find the weekday you were born, days until your next birthday, your zodiac and Chinese zodiac signs, birthstone, generation and fun age facts.
Read guideHealth & Body Calculators
How to Use BMR Calculator
Calculate your basal metabolic rate (BMR) with the Mifflin–St Jeor, Harris–Benedict or Katch–McArdle formula, plus daily calories by activity level.
Read guideHow to Use Daily Calorie Calculator
Find how many calories you need per day to maintain, lose or gain weight, based on your age, sex, height, weight and activity level. Free calorie calculator.
Read guideHow to Use Ideal Body Weight Calculator
Estimate your ideal body weight with the Robinson, Miller, Devine and Hamwi formulas, and see the healthy BMI weight range for your height. Free calculator.
Read guideHow to Use Body Fat Calculator
Estimate your body fat percentage with a tape measure using the U.S. Navy method, plus fat mass, lean mass and your ACE body fat category. Free calculator.
Read guideHow to Use Lean Body Mass Calculator
Calculate your lean body mass (weight without fat) using the Boer, James and Hume formulas, and see your estimated body fat percentage. Free LBM calculator.
Read guideHow to Use Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR), see your health risk level and body shape, and compare with the WHO thresholds for men and women. Free WHR calculator.
Read guideHow to Use BMI Calculator
Calculate your body mass index from height and weight in metric or imperial units, and see which BMI category you fall into. Free online BMI calculator.
Read guideHow to Use Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio and check the simple health rule: keep your waist to less than half your height. Free WHtR calculator with risk levels.
Read guideHow to Use Body Frame Size Calculator
Find out if you have a small, medium or large body frame from your height and wrist size. Use it to fine-tune your ideal weight. Free frame size calculator.
Read guideHow to Use Body Adiposity Index Calculator
Estimate your body fat percentage from hip size and height with the body adiposity index (BAI), and compare it with healthy ranges for your age and sex.
Read guideHow to Use Heart Rate Zone Calculator
Calculate your maximum heart rate and five training zones by age, or with your resting heart rate using the Karvonen method. Free heart rate zone calculator.
Read guideHow to Use Calories Burned by Distance
Estimate the calories you burn walking, running or cycling a distance, based on your body weight. Compare activities per km or mile. Free calorie calculator.
Read guideHow to Use Calorie Deficit Calculator
Find how many calories to eat each day to reach your goal weight by a target date, with your maintenance calories, daily deficit and weekly loss.
Read guideHow to Use Macro Calculator
Split your daily calories into protein, carbohydrate and fat grams for fat loss, maintenance or muscle gain with balanced, high-protein, low-carb or keto diets.
Read guideHow to Use Due Date Calculator
Estimate your baby’s due date from your last period, conception date, IVF transfer or an ultrasound, with conception and trimester dates.
Read guideHow to Use Pregnancy Week Calculator
See how many weeks and days pregnant you are, your trimester, your baby’s size, days to go and upcoming milestones such as scans and full term.
Read guideHow to Use Ovulation Calculator
Estimate your ovulation date and fertile window for the next six cycles from your last period, cycle length and luteal phase, with test dates.
Read guideHow to Use BAC Calculator
Estimate your blood alcohol concentration (BAC) from beers, wine and shots, body weight, sex and time since drinking, using the Widmark formula.
Read guideHow to Use Child Height Predictor
Predict a child’s adult height from the parents’ heights using the mid-parental height method, with the likely range for most children.
Read guideHow to Use Bra Size Calculator
Find your bra size from your underbust and bust measurements, with US, UK and EU sizes and sister sizes for brands that fit differently.
Read guideHow to Use Peptide Reconstitution Calculator
Work out the concentration of a reconstituted peptide and how many units to draw on a U-100 insulin syringe for your dose in mcg or mg.
Read guideFinancial Calculators
How to Use Mortgage Calculator
Calculate your monthly mortgage payment with property tax, insurance, PMI and HOA fees, plus the full amortization schedule and total interest.
Read guideHow to Use Auto Loan Calculator
Estimate your monthly car loan payment including down payment, trade-in, sales tax and fees, plus total interest and an amortization schedule. Free calculator.
Read guideHow to Use Personal Loan Calculator
Calculate personal loan payments, total interest and the true APR including the origination fee. See how much you actually receive and repay. Free calculator.
Read guideHow to Use Interest Calculator
Calculate simple or compound interest on savings or a loan, with daily, monthly, quarterly or yearly compounding and optional monthly contributions. Free.
Read guideHow to Use APR Calculator
Calculate the true annual percentage rate (APR) of a loan including upfront fees, and compare it with the interest rate. Free, accurate APR calculator.
Read guideHow to Use Mortgage APR Calculator
Calculate the APR of a mortgage including discount points and lender fees, and compare it with the note rate to find the real cost of a home loan offer.
Read guideHow to Use Credit Card Payoff Calculator
See how long it takes to pay off a credit card with a fixed monthly payment, or the payment needed to be debt-free by a date, plus total interest. Free.
Read guideHow to Use Tip Calculator
Calculate the tip and split the bill between any number of people. Choose a tip percentage and see each person's share. Free online tip calculator.
Read guideHow to Use Credit Card Minimum Payment Calculator
See how long paying only the minimum on a credit card takes and how much interest it costs, and how much a fixed payment would save. Free calculator.
Read guideHow to Use Loan Calculator
Estimate monthly loan payments, total interest and total cost for any fixed-rate loan, with a full payment schedule. Free online loan calculator.
Read guideHow to Use ROI Calculator
Calculate return on investment (ROI) as a percentage, your net profit or loss, and the annualized return (CAGR) to compare investments of different lengths.
Read guideHow to Use Rule of 72 Calculator
Estimate how many years it takes to double your money at an interest rate with the Rule of 72, or the rate needed to double it in a given number of years.
Read guideHow to Use Fixed Deposit (TDR) Calculator
Calculate TDR fixed deposit interest paid monthly, quarterly, half-yearly or yearly, with tax deduction, maturity date and payout schedule. Free calculator.
Read guideHow to Use Fixed Deposit (STDR) Calculator
Calculate the maturity amount of a compounding STDR fixed deposit with daily, monthly, quarterly or yearly compounding, tax and a growth schedule. Free.
Read guideHow to Use Recurring Deposit (DPS) Calculator
Calculate the maturity amount of a monthly DPS or recurring deposit with an optional starting deposit, total interest and a yearly savings schedule. Free.
Read guideHow to Use Hourly to Salary Calculator
Convert an hourly wage to annual, monthly, biweekly, weekly and daily salary, or a yearly salary back to an hourly rate. Free hourly to salary calculator.
Read guideHow to Use Salary Increase Calculator
Calculate your new salary after a raise by percentage or amount, the raise percentage between two salaries, and whether your raise beats inflation. Free.
Read guideHow to Use Profit Margin Calculator
Calculate gross profit, profit margin and markup from cost and selling price, for one item or a whole order. Free profit margin calculator for sellers.
Read guideHow to Use Sales Tax Calculator
Add sales tax, GST or VAT to a price, or remove it from a tax-inclusive total to find the price before tax. Works with any rate and currency. Free calculator.
Read guideHow to Use Currency Converter
Convert between 150+ world currencies, metals and crypto with daily updated exchange rates, including USD, EUR, GBP, PKR, INR, AED and SAR.
Read guideHow to Use Investment Calculator
Project how an investment grows with a starting amount, monthly contributions and compound returns, with a year-by-year table and inflation-adjusted value.
Read guideHow to Use Retirement Calculator
See whether your savings are on track for retirement: projected savings, the nest egg you need for your income, and the extra you should save each month.
Read guideHow to Use Inflation Calculator
See how inflation changes the value of money: what today’s amount will cost in the future, or what a past amount is worth now, with a yearly table.
Read guideHow to Use Rent vs Buy Calculator
Compare renting and buying a home over time, including mortgage, taxes, maintenance, home growth, rent increases and investing the savings.
Read guideHow to Use Net Worth Calculator
Add up your cash, investments, property and other assets, subtract mortgages, loans and card debt, and see your net worth and debt-to-asset ratio.
Read guideHow to Use EMI Calculator
Calculate the EMI (equated monthly instalment) for home, car and personal loans on a reducing or flat rate, with total interest and a yearly breakup.
Read guideHow to Use Amortization Calculator
Build a month-by-month loan amortization schedule with dates, principal, interest and balance, and see how extra payments cut interest and time.
Read guideHow to Use CD Calculator
Calculate the interest, APY and maturity value of a certificate of deposit from the deposit, rate (APY or APR), compounding and term, with optional tax.
Read guideHow to Use SIP Calculator
Estimate the future value of a systematic investment plan (SIP) from the monthly amount, expected return and period, with an optional yearly step-up.
Read guideHow to Use 401(k) Calculator
Project your 401(k) balance at retirement from salary, contribution rate, employer match, raises and returns, with 2026 contribution limits built in.
Read guideHow to Use Roth IRA Calculator
Estimate your Roth IRA balance at retirement and how much more it grows tax-free than a taxable account, using the 2026 contribution limits.
Read guideHow to Use Paycheck Calculator
Estimate your take-home pay per paycheck after federal and state income tax, Social Security, Medicare and 401(k), using 2026 US tax brackets.
Read guideHow to Use Markup Calculator
Find the selling price from cost and markup, or the markup from cost and price, with profit per item, gross margin and a markup-to-margin table.
Read guideHow to Use Zakat Calculator
Calculate the zakat due on your cash, gold, silver, investments and business wealth at 2.5%, using the gold or silver nisab threshold.
Read guideSocial Media Tools
How to Use YouTube Thumbnail Grabber
Download YouTube thumbnails in every size, from HD and maxres to small previews. Paste a video URL or ID and save the image. Free thumbnail grabber.
Read guideHow to Use Fancy Text Generator
Generate fancy text in dozens of Unicode styles: bold, italic, script, bubble and more. Copy and paste into Instagram, TikTok, X and bios. Free tool.
Read guideHow to Use Social Post Character Counter
Count characters, words, hashtags and mentions in social media posts and check them against built-in platform limits. Free social post character counter.
Read guideHow to Use Open Graph Meta Generator
Generate Open Graph and Twitter Card meta tags for your page and preview how links look when shared on social media. Free OG tag generator.
Read guideHow to Use Thread Splitter
Split long text into a thread of posts that fit X, Threads or Bluesky limits, with optional numbering like 1/5. Copy each post. Free thread splitter.
Read guideHow to Use Instagram Caption Formatter
Format Instagram captions with line breaks that stay put. Add spacing between paragraphs, preview the caption and copy it. Free caption formatter.
Read guideHow to Use UTM Link Builder
Build UTM tracking links for Google Analytics. Add source, medium, campaign, term and content parameters to any URL and copy it. Free UTM builder.
Read guideHow to Use YouTube Embed Code Generator
Generate responsive YouTube embed code with autoplay, mute, loop, start time and player controls. Preview it and copy the iframe. Free generator.
Read guideHow to Use WhatsApp Link Generator
Create a WhatsApp click-to-chat link with an optional pre-filled message. Add it to your website, email signature or social profiles. Free link generator.
Read guideHow to Use Emoji Picker
Browse and search emojis by name or category, collect several at once and copy them in one click. Free online emoji picker for posts and messages.
Read guideHow to Use Social Photo Filters
Apply Instagram-style photo filters online and control the intensity of each look. Download your edited photo free, with no app or sign-up needed.
Read guideHow to Use Vimeo Thumbnail Grabber
Get the thumbnail image of any public Vimeo video in the available sizes, plus the video title and details. Paste a URL and download. Free tool.
Read guideDNS Tools
How to Use DNS Propagation Checker
Check DNS propagation worldwide. Query 22 public DNS resolvers in 11 countries for A, AAAA, MX, NS, TXT, CNAME and more records at once.
Read guideHow to Use Domain DNS Health Checker
Run a DNS health check for any domain: nameservers, SOA timers, web and mail records, SPF, DMARC, DNSSEC and CAA, with clear pass and warning results.
Read guideHow to Use CNAME Lookup
Look up the CNAME record of any host name and follow the full alias chain to the final canonical name and its IPv4 and IPv6 addresses.
Read guideHow to Use DNS Lookup
Look up A, AAAA, CNAME, MX, NS, TXT, SOA and CAA DNS records for any domain, or reverse DNS (PTR) for an IP address. Free online DNS lookup tool.
Read guideHow to Use NS Lookup
Find the authoritative nameservers (NS records) of any domain, with the IPv4 and IPv6 address of each nameserver and its TTL, in seconds.
Read guideHow to Use MX Lookup
Look up the MX records of a domain to see which mail servers receive its email, in priority order, with IP addresses and the email provider.
Read guideHow to Use Reverse IP Lookup
Find the hostname behind an IPv4 or IPv6 address with a reverse DNS (PTR) lookup, and check whether it is forward-confirmed (FCrDNS).
Read guideHow to Use DNSKEY Lookup
Look up the DNSKEY records of a DNSSEC-signed domain and see each key’s role (KSK or ZSK), key tag, algorithm and whether answers validate.
Read guideHow to Use DS Record Lookup
Check the DS (delegation signer) records a domain has at its parent zone, with key tag, algorithm and digest type, to confirm DNSSEC is linked.
Read guideHow to Use SPF Record Checker
Check and validate the SPF record of a domain. Count DNS lookups against the limit of 10, follow every include and see each mechanism explained.
Read guideHow to Use DKIM Checker
Look up and validate a DKIM record by domain and selector, or try 30 common selectors automatically. Checks key type, key length and test mode.
Read guideHow to Use DMARC Checker
Look up and validate a domain’s DMARC record. See the policy, reporting addresses and alignment settings, with every tag explained in plain English.
Read guideHow to Use DMARC Record Generator
Generate a valid DMARC TXT record with policy, subdomain policy, report addresses, percentage and alignment options, ready to paste into your DNS.
Read guideHow to Use BIMI Checker & Generator
Check a domain’s BIMI record and logo preview, confirm the DMARC policy meets BIMI rules, and generate a new BIMI TXT record for your brand.
Read guideIP & Network Tools
How to Use IP Location Lookup
Find the location of any IP address or domain: country, region, city, time zone, ISP, organization and ASN, shown on a map. Checks your own IP too.
Read guideHow to Use What Is My ISP
Find out who your internet service provider (ISP) is, along with your public IP address, ASN, organization and approximate location, in one click.
Read guideHow to Use What Is My IP Address
See your public IP address (IPv4 or IPv6) instantly, plus your browser, operating system, device, language, time zone, screen size and user agent.
Read guideHow to Use IP WHOIS Lookup
Look up who owns an IPv4 or IPv6 address: network name, organization, address range, CIDR, country and abuse contact, straight from the regional registry.
Read guideHow to Use ASN WHOIS Lookup
Look up an autonomous system number (ASN) to see the network name, organization, country, registration dates and abuse contact from its registry.
Read guideHow to Use IPv4 Subnet Calculator
Calculate the network address, broadcast, usable host range, subnet mask and wildcard for any IPv4 address and CIDR prefix, and split networks into subnets.
Read guideHow to Use Online Ping Test
Ping a website or IP address online from our server. See the response time of four TCP pings with minimum, average and maximum latency and packet loss.
Read guideHow to Use IPv6 Subnet Calculator
Calculate IPv6 network prefixes, address ranges and the number of addresses, expand or compress addresses, and split a prefix into smaller subnets. Free.
Read guideHow to Use Open Port Checker
Check whether a TCP port is open on a public IP address or domain from the internet. Test port forwarding for games, cameras, servers and more.
Read guideHow to Use IP to Decimal Converter
Convert IPv4 and IPv6 addresses to decimal, hexadecimal and binary numbers, or turn a decimal number back into an IP address. Converts many lines at once.
Read guideHow to Use IPv4 to IPv6 Converter
Convert an IPv4 address to its IPv6 forms: IPv4-mapped, expanded, 6to4 prefix, NAT64 and the deprecated IPv4-compatible format. Click any result to copy.
Read guideHow to Use IPv6 to IPv4 Converter
Extract the IPv4 address embedded in IPv6 addresses: IPv4-mapped, NAT64, 6to4, Teredo and IPv4-compatible formats. Converts a list of addresses at once.
Read guideHow to Use IPv6 CIDR to Range
Convert IPv6 CIDR blocks to address ranges with the first and last address in full and the number of addresses. Handles many prefixes at once.
Read guideHow to Use IPv6 Range to CIDR
Convert a start and end IPv6 or IPv4 address into the smallest list of CIDR blocks that covers the range exactly, ready for firewalls and ACLs.
Read guideHow to Use IPv6 Compression Tool
Compress IPv6 addresses to the canonical short form from RFC 5952: leading zeros removed and the longest run of zero groups replaced with a double colon.
Read guideHow to Use IPv6 Expand Tool
Expand shortened IPv6 addresses to the full form with all eight groups of four hexadecimal digits, for reverse DNS, databases and firewall rules.
Read guideHow to Use IPv6 Compatibility Checker
Check whether a website supports IPv6: its web, www, nameserver and mail server addresses are tested for AAAA records, with an overall readiness score.
Read guideHow to Use MAC Address Lookup
Find the manufacturer of a network device from its MAC address. Shows the vendor, OUI prefix, unicast or multicast type and the address in other formats.
Read guideHow to Use MAC Address Generator
Generate random MAC addresses in colon, hyphen, Cisco or plain format, with an optional vendor prefix and safe locally administered addresses for VMs.
Read guideHow to Use RAID Calculator
Calculate usable storage, fault tolerance, efficiency and speed gains for RAID 0, 1, 5, 6, 10, 50, 60 and JBOD from the number and size of disks.
Read guideWebmaster & SEO Tools
How to Use HTTP Headers Checker
Check the HTTP response headers and status code of any URL, follow redirects and review security headers such as HSTS, CSP and X-Frame-Options.
Read guideHow to Use Domain Age Checker
Check how old a domain is. See its registration date, exact age, expiry date, registrar and name servers from the public RDAP registry record. Free.
Read guideHow to Use Redirect Checker
Trace every redirect of a URL with its status code (301, 302, 307, 308) and the final destination, and spot long chains, temporary redirects and HTTP loops.
Read guideHow to Use Is Website Down Checker
Check whether a website is down for everyone or just you. See the HTTP status, response time, server and IP address as our server tries to load the site.
Read guideHow to Use Website Server & OS Checker
Find out which web server, operating system, CDN, CMS and frameworks a website uses, detected from its HTTP headers and page HTML, in one check.
Read guideHow to Use GZIP Compression Checker
Test whether a website uses GZIP or Brotli compression, see the uncompressed and compressed page size and how much bandwidth compression saves.
Read guideHow to Use Robots.txt Checker
Fetch and validate any site’s robots.txt, see the rules for each crawler and test whether a URL is allowed for Googlebot, Bingbot, GPTBot and others.
Read guideHow to Use XML Sitemap Validator
Validate an XML sitemap or sitemap index: namespace, URLs, lastmod dates, changefreq and priority values, duplicates and size limits, with a full URL list.
Read guideHow to Use Website Link Analyzer
List every internal and external link on a web page with anchor text and rel attributes, and count nofollow, sponsored, image and empty-anchor links.
Read guideHow to Use Broken Link Checker
Scan a web page for broken links. Every link is requested and its HTTP status shown, with broken (4xx, 5xx) and redirected links listed first.
Read guideHow to Use Open Graph Checker
Preview how a link looks on Facebook, X, LinkedIn and WhatsApp, and check its Open Graph and Twitter Card tags for missing titles, images and descriptions.
Read guideHow to Use AMP Validator
Validate an AMP page with the official AMP validator. See whether it passes and every error and warning with its line number and documentation link.
Read guideHow to Use Responsive Design Checker
Preview a website at phone, large phone, tablet, laptop and desktop screen sizes side by side to test responsive layouts, with adjustable zoom.
Read guideHow to Use Website Screenshot Generator
Capture a screenshot of any public website at desktop, full HD, tablet or phone size, and open the full-size image to save it, without any browser extension.
Read guideHow to Use App Screenshots Downloader
Download the screenshots and icon of any App Store or Google Play app in full resolution. Paste the store link, app ID or package name to get them.
Read guideHow to Use Google SERP Simulator
Preview how your page title, URL and meta description look in Google results on desktop and mobile, with pixel-width checks that show where text is cut off.
Read guideHow to Use Domain Expiration Checker
Check when a domain name expires and how many days are left, with the registrar, registration date and status from the official RDAP registry record.
Read guideHow to Use Domain Availability Checker
Check whether a domain name is available to register across popular extensions like .com, .net, .org, .io, .ai and country domains, all at once.
Read guideHow to Use Domain Name Generator
Generate brandable domain name ideas from your keywords with prefixes, suffixes and blends, then check whether each name is available in one click.
Read guideHow to Use HTACCESS Redirect Generator
Generate .htaccess redirect rules for Apache: single page and folder 301s, domain moves, HTTP to HTTPS, www or non-www, trailing slashes and extensions.
Read guideHow to Use Robots.txt Generator
Create a robots.txt file for your website. Block paths, allow exceptions, stop AI crawlers like GPTBot and add your sitemap. Copy or download it free.
Read guideHow to Use URL Rewrite Generator
Turn dynamic URLs like product.php?id=12 into SEO-friendly URLs such as /product/12 and generate the Apache mod_rewrite rule that serves them.
Read guideHow to Use Website SEO Audit
Audit your website for technical SEO issues: titles, meta descriptions, headings, HTTPS, broken pages, sitemap, robots.txt and more. Free SEO site audit tool.
Read guideHow to Use Punycode Converter
Convert internationalized domain names (IDN) with non-Latin characters to Punycode (xn--) and back. Converts many domains or full URLs at once.
Read guideHow to Use Keyword Density Checker
Check keyword density and the most-used words and 2 and 3-word phrases in your content, with a target keyword check and advice to avoid keyword stuffing.
Read guideHow to Use Share Link Generator
Create share links for Facebook, X, LinkedIn, WhatsApp, Telegram, Reddit, Pinterest, Threads, Bluesky and email, plus ready HTML share buttons for your site.
Read guideHow to Use Word Frequency Counter
Count how many times each word appears in a text, sort by frequency or alphabetically, exclude common words and export the list as CSV. Free word counter.
Read guideHow to Use Multiple URL Opener
Open a list of URLs in new browser tabs at once. Paste links one per line or any text containing links, then open them all with an optional delay.
Read guideHow to Use SMTP Test Tool
Test your SMTP server by sending a real test email. Check the connection, TLS or SSL encryption and login, and see the full SMTP conversation.
Read guideHow to Use A/B Test Calculator
Check whether an A/B test result is statistically significant. Enter visitors and conversions for both versions to see uplift, p-value and confidence.
Read guideSecurity & Encoding Tools
How to Use SSL Certificate Checker
Check the SSL/TLS certificate of any website: issuer, expiry date, days left, trust, host name match, protocol, SANs and the full certificate chain.
Read guideHow to Use Password Generator
Generate strong, random passwords with your choice of length, uppercase, numbers and symbols. Created in your browser and never sent anywhere. Free.
Read guideHow to Use Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text. Switch between standard and URL-safe alphabets and copy the result directly in your browser.
Read guideHow to Use Password Strength Checker
Test how strong a password is and how long it could take to crack. Detects common passwords, words, dates and keyboard patterns, entirely in your browser.
Read guideHow to Use URL Encoder / Decoder
Encode or decode URL text with component and full-URL modes. Convert spaces and special characters to percent encoding and copy the result.
Read guideHow to Use Credit Card Validator
Check whether a card number is valid with the Luhn algorithm, detect the network (Visa, Mastercard, Amex and more) and verify the length, privately.
Read guideHow to Use BIN Checker
Look up a card BIN (the first 6 to 8 digits) to see the card network, type, level, prepaid status, issuing bank, country and currency.
Read guideHow to Use Bcrypt Hash Generator
Generate a bcrypt hash or check whether sample text matches an existing hash. Choose a cost factor; hashing and verification run on ToolzHive’s server.
Read guideHow to Use Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text online. Free hash generator for checksums and testing, runs in your browser.
Read guideHow to Use Email Verifier
Verify an email address: syntax, domain, mail servers (MX), disposable email providers, role accounts and common typos such as gmial.com, in seconds.
Read guideHow to Use CRC32 Checksum Generator
Calculate the CRC32 checksum of any text instantly, matching ZIP, PNG and PHP crc32(). Compare with a known value. Free CRC32 calculator in your browser.
Read guideHow to Use RIPEMD-160 Hash Generator
Generate the 160-bit RIPEMD-160 hash of any text online and compare it with a known hash. Free RIPEMD160 generator, as used in Bitcoin addresses.
Read guideHow to Use Whirlpool Hash Generator
Generate the 512-bit Whirlpool hash of any text online and compare it with a known hash. Free Whirlpool generator using the ISO-standard algorithm.
Read guideHow to Use Passphrase Generator
Generate strong, memorable passphrases from random words with a secure random generator, custom separators, numbers and symbols, and a strength meter.
Read guideHow to Use Morse Code Translator
Translate text to Morse code and Morse code back to text, then play it as sound. Free online Morse code translator and audio player. No sign-up needed.
Read guideHow to Use ROT13 Encoder / Decoder
Encode or decode text with ROT13, ROT5, ROT18, ROT47 or a Caesar cipher with any shift, and try all 25 shifts to crack an unknown Caesar message.
Read guideDevice & Browser Tests
How to Use Screen Test
Test your monitor or phone screen with full-screen red, green, blue, white, black and gray, plus gradients, grids and patterns to spot defects.
Read guideHow to Use Dead Pixel Test
Find dead or stuck pixels by cycling full-screen black, white, red, green and blue, then try to revive stuck pixels with a fast-flashing pixel fixer.
Read guideHow to Use Touch Screen Test
Test your touch screen for dead zones and multi-touch support by drawing on it. Touched areas light up and the number of fingers is counted.
Read guideHow to Use White Screen
Open a full-screen white page for cleaning your monitor, lighting video calls, spotting dust and dead pixels, or tracing drawings. Any color works too.
Read guideHow to Use Black Screen
Open a full-screen black page to check backlight bleed and glow, hide what is on screen, or rest your eyes. On OLED screens the pixels switch off.
Read guideHow to Use Mouse Test
Test your mouse online: left, right, middle, back and forward buttons, double clicks, scroll wheel direction, pointer position and movement rate.
Read guideHow to Use Keyboard Tester
Press keys to check that every key on your keyboard works. Keys light up on a full layout and show their key, code, key code and location.
Read guideHow to Use Microphone Test
Test your microphone online with a live volume meter and waveform, choose between devices, and record a 5-second clip to hear how you sound.
Read guideHow to Use Webcam Test
Check that your webcam works, see its resolution, maximum resolution and frame rate, mirror the image and take a snapshot, all in your browser.
Read guideHow to Use Speaker Test
Test your left and right speakers or headphones with tones, adjustable frequency and waveform, and a 20 Hz to 20 kHz sweep to find your hearing range.
Read guideHow to Use What Is My User Agent
See your browser’s user agent string and what it reveals: browser and version, rendering engine, operating system and device type. Parse any user agent too.
Read guideHow to Use What Is My Screen Resolution
See your screen resolution, browser window size, device pixel ratio, physical pixels, color depth, aspect ratio and orientation, updated live as you resize.
Read guideProductivity Tools
How to Use Notepad Online
A free online notepad that saves automatically in your browser. Keep several notes, see word and character counts, and copy or download notes as text.
Read guideHow to Use Resume Builder
Build a professional resume or CV online for free. Pick a template, fill in your details with a live A4 preview, then save it as PDF or HTML. No sign-up.
Read guideHow to Use Typing Speed Test
Test your typing speed in words per minute (WPM) and accuracy with 30-second to 5-minute tests, live results and a skill level at the end.
Read guideHow to Use QR Code Scanner
Scan QR codes and barcodes with your webcam or from an image or screenshot. Links, Wi-Fi, contacts and events are recognized and can be opened or copied.
Read guideHow to Use WiFi QR Code Scanner
Scan a Wi-Fi QR code with your camera or from an image to reveal the network name, password and security type, and copy the password in one click.
Read guideHow to Use Spin the Wheel
Spin a wheel to pick a random name, winner or decision. Use ready-made yes/no, dice and prize wheels, remove winners, go full screen and share your wheel.
Read guideHow to Use Create ZIP File
Combine files or a whole folder into a ZIP archive in your browser, without uploading them. Choose compression, name the archive and download it.
Read guideHow to Use Internet Speed Test
Test your internet speed: download and upload in Mbps, plus latency (ping) and jitter, measured against Cloudflare’s nearest speed test server.
Read guideHow to Use Reverse Image Search
Search an image by URL on Google Lens, Bing, Yandex, TinEye and Baidu at once, or choose an image from your device and open each engine to upload it.
Read guideHow to Use Username Checker
Check whether a username is available on GitHub, GitLab, Docker Hub, DEV, Mastodon, Bluesky, Chess.com, Lichess, Codeberg, Keybase and more.
Read guideHow to Use Love Calculator
A just-for-fun love calculator: enter two names to get a compatibility percentage and a playful message. The same names always give the same result.
Read guideHow to Use QR Code Generator
Create QR codes for URLs, text, Wi-Fi, email, phone numbers and contacts. Customize colors and download your QR code as PNG or SVG for free.
Read guideHow to Use Barcode Generator
Generate barcodes online: Code 128, EAN-13, UPC, Code 39 and more. Customize size and colors and download as PNG or SVG. Free barcode generator.
Read guideSize Charts
How to Use Bed Size Chart
Mattress dimensions for twin, twin XL, full, queen, king and California king beds in the US, plus UK and European bed sizes, in inches and cm.
Read guideHow to Use Bedding Size Chart
Flat sheet, fitted sheet, duvet, comforter and blanket sizes for twin, full, queen, king and California king beds, plus UK duvet sizes.
Read guideHow to Use Rug Size Chart
Standard area rug sizes from 2 × 3 to 12 × 15 ft and round rugs, in feet and centimeters, with the rooms and furniture each size fits best.
Read guideHow to Use Runner Rug Sizes
Standard hallway and kitchen runner rug sizes from 2 × 6 to 2.5 × 14 ft in feet and centimeters, with tips for choosing the right length and width.
Read guideHow to Use Outdoor Rug Sizes
Standard outdoor and patio rug sizes from 4 × 6 to 10 × 14 ft in feet and centimeters, with the patio furniture and spaces each size suits.
Read guideHow to Use Bath Mat Sizes
Standard bath mat, bath rug, contour and runner sizes in inches and centimeters, with where each size fits best in small and large bathrooms.
Read guideHow to Use Carpet Sizes
Standard carpet roll widths for the US and UK, carpet tile sizes and typical room carpet sizes with their area, in feet, meters and centimeters.
Read guideHow to Use Photo Print Sizes
Standard photo print sizes from wallet to 24 × 36 in and A4, with aspect ratios and the pixels needed for a sharp print at 300 and 150 DPI.
Read guideHow to Use Picture Frame Sizes
Standard picture frame sizes, the photo each fits with a mat and the mat opening size, in inches and centimeters, plus international A-size frames.
Read guideHow to Use Pillow Sizes
Standard, queen, king, Euro, body and travel pillow sizes, plus UK and European pillows and decorative cushion sizes, in inches and centimeters.
Read guideHow to Use Shower Curtain Sizes
Standard, long, extra-long, stall and extra-wide shower curtain and liner sizes in inches and centimeters, plus UK sizes and fitting tips.
Read guideHow to Use Door Sizes
Standard interior, exterior, sliding, double and garage door sizes in the US, and UK internal door sizes, in inches, feet and centimeters.
Read guideResearch & Academic Tools
How to Use Sample Size Calculator
Calculate sample size for prevalence surveys, means, two proportions, case-control, cohort studies and RCTs, with power, dropout and design effect.
Read guideHow to Use Odds Ratio Calculator
Calculate the odds ratio from a 2×2 table with Woolf confidence interval, z-test and Fisher’s exact p-value, for case-control studies and more.
Read guideHow to Use Relative Risk Calculator
Calculate relative risk, risk difference, absolute and relative risk reduction and NNT with confidence intervals from cohort or trial 2×2 data.
Read guideHow to Use Diagnostic Accuracy Calculator
Calculate sensitivity, specificity, PPV, NPV, likelihood ratios, accuracy, Youden index and diagnostic odds ratio with 95% CIs from a 2×2 table.
Read guideHow to Use NNT / NNH Calculator
Calculate the number needed to treat or harm, absolute and relative risk reduction, from event counts or rates, with Altman’s confidence interval.
Read guideHow to Use 2×2 Contingency Table Calculator
Analyse a 2×2 table with Pearson and Yates chi-square, Fisher’s exact test, odds ratio, relative risk, risk difference and expected counts.
Read guideHow to Use Mean, SD & SEM Calculator
Paste your data to get the mean, standard deviation, standard error of the mean, 95% CI, median, quartiles, variance and range in one step.
Read guideHow to Use Confidence Interval Calculator
Calculate confidence intervals for a mean, a proportion (Wilson and exact), the difference between two means or proportions, and odds ratios.
Read guideHow to Use P-value Calculator
Convert z, t, chi-square, F and correlation r test statistics into exact p-values, one- or two-tailed, and compare them with your significance level.
Read guideHow to Use Effect Size Calculator
Calculate Cohen’s d, Hedges’ g, Glass’s Δ, r, eta-squared and phi from means, t, F, chi-square, r or odds ratios, with confidence intervals.
Read guideHow to Use Statistical Power Calculator
Calculate statistical power or the sample size needed for t-tests, paired designs, two proportions and correlations, with any alpha and allocation ratio.
Read guideHow to Use SD, SE & CI Converter
Convert between standard deviation, standard error and confidence interval of a mean, using t or z, following the Cochrane Handbook formulas.
Read guideHow to Use Meta-analysis Effect Converter
Convert odds ratios and CIs to log effects and SEs, p-values to SEs, medians and IQRs to means and SDs, and Cohen’s d to Hedges’ g for meta-analysis.
Read guideHow to Use I² Heterogeneity Calculator
Calculate Cochran’s Q, I² with its confidence interval, H², τ² and fixed and random-effects pooled estimates from study effects and standard errors.
Read guideHow to Use Leave-One-Out Meta-analysis
Run a leave-one-out sensitivity analysis: re-pool your meta-analysis without each study in turn and see which studies change the result or I².
Read guideHow to Use PRISMA Flow Diagram Generator
Create a PRISMA 2020 flow diagram for your systematic review, with per-database counts, exclusion reasons and other methods, then export SVG, PNG or PDF.
Read guideHow to Use Reference Formatter (DOI to Citation)
Turn DOIs into formatted references in Vancouver, APA 7, AMA, Harvard, Chicago, IEEE or MLA using Crossref data, and export RIS or BibTeX.
Read guideHow to Use Vancouver Reference Generator
Create Vancouver (ICMJE/NLM) references for journal articles, books, chapters and web pages, fill them from a DOI and build a numbered reference list.
Read guideHow to Use DOI Extractor
Extract every DOI from a reference list or any text, strip trailing punctuation, remove duplicates, flag broken DOIs and export them as text or CSV.
Read guideHow to Use PMID Extractor
Extract PubMed IDs (PMIDs) from references, notes and PubMed links, remove duplicates and open them all in PubMed or copy them as a search query.
Read guideHow to Use Reference Duplicate Finder
Find duplicate references in a bibliography or search export by DOI, PMID, identical title and near-identical titles, then copy a deduplicated list.
Read guideHow to Use Journal Abbreviation Finder
Find the official NLM (MEDLINE) and ISO abbreviations of journal titles from the NLM Catalog, expand abbreviations, and see ISSNs and indexing status.
Read guideHow to Use Citation Number Checker
Check numbered in-text citations for gaps, uncited references, first-appearance order, reversed ranges and repeated numbers before you submit.
Read guideHow to Use CSV Descriptive Statistics
Upload or paste a CSV file to get N, missing values, mean, SD, SE, median, quartiles, min and max for every numeric column, plus category counts.
Read guideHow to Use Missing Data Checker
Check a CSV dataset for missing values: count and percentage per variable, complete cases and incomplete rows, with custom missing codes like -99.
Read guideHow to Use Outlier Detector
Find outliers in a data column with the IQR (Tukey) rule, z-scores or modified z-scores, see each flagged row and download them without deleting data.
Read guideHow to Use Normality Checker
Test whether your data are normally distributed with the Shapiro–Wilk and Jarque–Bera tests, skewness and kurtosis, a histogram and a Q–Q plot.
Read guideMedical & Clinical Tools
How to Use eGFR Calculator
Estimate GFR with the race-free CKD-EPI 2021 creatinine and creatinine–cystatin C equations, compare with MDRD and see the CKD stage from G1 to G5.
Read guideHow to Use Creatinine Clearance Calculator
Calculate Cockcroft–Gault creatinine clearance with actual, ideal and adjusted body weight for renal drug dosing, in mg/dL or µmol/L creatinine.
Read guideHow to Use Corrected Calcium Calculator
Correct total serum calcium for low albumin with Payne’s formula in mg/dL or mmol/L, and see whether the corrected value is low, normal or high.
Read guideHow to Use Corrected Sodium Calculator
Correct serum sodium for high blood glucose with the Hillier (2.4) and Katz (1.6) factors to reveal true hyponatremia or hidden hypernatremia.
Read guideHow to Use Anion Gap Calculator
Calculate the serum anion gap, the albumin-corrected gap and the delta ratio to classify metabolic acidosis and spot mixed acid–base disorders.
Read guideHow to Use Serum Osmolality Calculator
Calculate serum osmolality from sodium, glucose, urea and ethanol in mg/dL or mmol/L, and the osmolal gap from a measured value to screen for toxins.
Read guideHow to Use Body Surface Area Calculator
Calculate body surface area in m² with the Mosteller, DuBois, Haycock, Gehan–George and Boyd formulas, in metric or imperial units, for dosing.
Read guideHow to Use Adjusted Body Weight Calculator
Calculate ideal body weight (Devine), adjusted body weight and lean body weight for drug dosing in obesity, with the percentage of ideal weight.
Read guideHow to Use QTc Calculator
Calculate the corrected QT interval with the Bazett, Fridericia, Framingham and Hodges formulas from QT and heart rate or RR, with prolongation flags.
Read guideHow to Use Mean Arterial Pressure Calculator
Calculate mean arterial pressure and pulse pressure from systolic and diastolic blood pressure, with an optional heart-rate-adjusted estimate.
Read guideHow to Use Shock Index Calculator
Calculate the shock index (HR ÷ systolic BP), the modified shock index and the age shock index to spot hidden hemodynamic instability early.
Read guideHow to Use P/F Ratio Calculator
Calculate the PaO₂/FiO₂ ratio in mmHg or kPa with Berlin ARDS severity (mild, moderate, severe) and the SpO₂/FiO₂ ratio when no blood gas is available.
Read guideHow to Use A–a Gradient Calculator
Calculate the alveolar–arterial oxygen gradient from FiO₂, PaO₂, PaCO₂ and barometric pressure, and compare it with the expected value for age.
Read guideHow to Use Medical Lab Unit Converter
Convert 30 lab tests between conventional (US) and SI units: glucose, cholesterol, creatinine, urea, hemoglobin, vitamin D, B12, hormones and more.
Read guideHow to Use Blood Glucose Converter
Convert blood sugar between mg/dL and mmol/L, see whether a fasting value is normal, prediabetes or diabetes, and use a quick conversion chart.
Read guideHow to Use Cholesterol Unit Converter
Convert total, LDL, HDL and non-HDL cholesterol and triglycerides between mg/dL and mmol/L with the correct factor for each lipid.
Read guideHow to Use Creatinine Unit Converter
Convert serum creatinine between mg/dL and µmol/L (1 mg/dL = 88.42 µmol/L) with a quick conversion table, then estimate kidney function.
Read guideHow to Use HbA1c Converter
Convert HbA1c between percent (NGSP/DCCT) and mmol/mol (IFCC), and to estimated average glucose (eAG) in mg/dL and mmol/L, with a reference table.
Read guideHow to Use Drug Dose Calculator
Calculate weight-based (mg/kg, mcg/kg, units/kg) or BSA-based (mg/m²) drug doses per dose and per day, with a maximum-dose cap and volume to give.
Read guideHow to Use Drug Dilution Calculator
Solve C1V1 = C2V2 to find the stock volume and diluent needed, the final concentration, the final volume or the stock concentration of a solution.
Read guideHow to Use IV Infusion Rate Calculator
Calculate IV infusion rates in mL/h and drops per minute from volume and time, or from weight-based doses like mcg/kg/min, and check the dose a rate delivers.
Read guideHow to Use Drug Half-Life Calculator
Calculate drug elimination half-life from two concentrations or the rate constant k, convert between k and t½, and see how much drug remains over time.
Read guideHow to Use Pharmacokinetic Calculator
Non-compartmental pharmacokinetics from time–concentration data: Cmax, Tmax, AUC to last and infinity, λz, half-life, MRT, clearance and volume.
Read guideHow to Use Loading Dose Calculator
Calculate a drug loading dose from the target concentration, volume of distribution, bioavailability and salt factor, including top-up doses.
Read guideHow to Use Maintenance Dose Calculator
Calculate a maintenance dose from clearance, target average steady-state concentration, dosing interval, bioavailability and salt factor.
Read guideHow to Use Incidence Calculator
Calculate cumulative incidence (risk) of new cases in a population at risk per 100, 1,000 or 100,000 people with an exact Clopper–Pearson confidence interval.
Read guideHow to Use Person-Time Incidence Rate Calculator
Calculate the incidence rate (incidence density) per 1,000 or 100,000 person-years, months or days, with an exact Poisson confidence interval.
Read guideHow to Use Prevalence Calculator
Calculate point or period prevalence per 100, 1,000 or 100,000 with an exact confidence interval, or estimate prevalence from incidence and duration.
Read guideHow to Use Attack Rate Calculator
Calculate attack rates, food- or source-specific attack rates with the attack rate ratio, and secondary attack rates during an outbreak investigation.
Read guideHow to Use Mortality Rate Calculator
Calculate crude, cause-specific, age-specific, infant, neonatal and under-5 mortality rates, the maternal mortality ratio and proportional mortality.
Read guideHow to Use Case Fatality Rate Calculator
Calculate the case fatality rate with an exact confidence interval, and the CFR among resolved cases to reduce bias during an ongoing outbreak.
Read guideHow to Use Attributable Risk Calculator
Calculate attributable risk (risk difference), the attributable fraction among the exposed and the number needed to harm from counts or risks.
Read guideHow to Use Population Attributable Risk Calculator
Calculate the population attributable risk and fraction with Levin’s formula, Miettinen’s formula or population risks, and the number of preventable cases.
Read guide