Plagiarism Checker
Check your writing against pasted source text and highlight matching phrases privately in your browser.
Compare your writing with a source
Paste your writing and a source to find shared phrases. This checker compares only the supplied text; it does not search the web or academic databases. Your text stays in your browser.
Maximum 100,000 characters per text. Matching ignores capitalization and punctuation.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Plagiarism Checker
Find matching word sequences between your writing and a supplied reference. Use the highlighted passages to review quotations, citations and possible copied wording.
- 1 Paste your writing and the source text, up to 100,000 characters each.
- 2 Choose the minimum matching phrase length and click Check for matches.
- 3 Review highlighted passages and citations, then download the comparison report if needed.
Example and practical tips
Use Try example to compare two short paragraphs with one shared sentence, then change the phrase length to see how matching changes.
Frequently asked questions
Does this search the internet?
No. It compares only the source text you paste. Websites, academic databases and other documents are not searched.
What does the percentage mean?
It is the share of words in your writing covered by matching phrases of the chosen length. Overlapping matches count once. Capitalization and punctuation are ignored.
Does a match prove plagiarism?
No. Common phrases and properly cited quotations can match. Review attribution and context yourself. A zero score does not prove originality, and paraphrased ideas may go undetected.
Is my writing uploaded?
No. Comparison runs in your browser. Text is not uploaded or saved by this tool.
Practical guides
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How 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.
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