ToolzHive Blog

Images Files Web

AVIF vs WebP: The Next Image Formats

WebP shaved a third off JPG; now AVIF is doing the same to WebP. Here is how the two modern image formats compare, and how to serve them safely.

October 13, 2026 · 4 min read

Images Files

JPG vs PNG vs WebP: Which to Use

The right image format follows one simple question: photo or graphic? Here is how to choose between JPG, PNG and WebP — and convert without losing quality.

October 11, 2026 · 4 min read

QR Codes Productivity

How QR Codes Actually Work

A QR code looks like noise, but every square is doing a job. Here is how the pattern stores data and why error correction makes it so robust.

October 10, 2026 · 4 min read

Security Passwords

Password Strength Is About Entropy

P@ssw0rd! passes every complexity rule and falls in seconds. The thing that really makes a password hard to guess is entropy — here is what that means.

October 7, 2026 · 4 min read

Security Passwords

Passkeys vs Passwords: What Changes

The industry is quietly trying to retire the password. Here is what a passkey actually is, and what changes for your logins and security.

October 6, 2026 · 3 min read

PDF Files

How PDF Compression Works

Why your PDF is huge, what a compressor actually does, and how to shrink a file for email or print without turning it into a blurry mess.

October 3, 2026 · 4 min read

Coding Data

JSON vs YAML for Config Files

JSON and YAML can hold identical data. The difference is who the file is for — a strict machine or a human editing by hand. Here is how to choose.

October 2, 2026 · 3 min read

Research Statistics

How to Choose a Sample Size for a Study

How many people do you need? It is not guesswork. Four decisions — made before you recruit anyone — set the sample size for a survey or study.

September 29, 2026 · 4 min read

Coding Regex

Regex Basics Every Developer Needs

Regex looks like line noise, but underneath is a small language for matching text. Learn a dozen pieces and the rest is combination.

September 27, 2026 · 3 min read

Coding Security

What's Inside a JWT

That long token your app stores after login is not encrypted. Here is what the three parts of a JWT hold and the classic mistakes to avoid.

September 23, 2026 · 4 min read

Health Lab values Units

mg/dL vs mmol/L: Reading Blood Test Units

A glucose of 100 mg/dL and 5.6 mmol/L mean the same thing. Here is how to convert blood test units correctly — and why one factor never fits all.

September 22, 2026 · 4 min read

Coding Databases

UUIDs vs Sequential IDs

When a database needs a unique ID, you can count 1, 2, 3 or use a random UUID. Each has real strengths — and picking wrong causes pain later.

September 18, 2026 · 3 min read