Plagiarism Checker
Compare two texts to calculate their similarity percentage (Client-side comparision).
Last reviewed by the Radiatus Cloud team
Privacy Note: This is a client-side comparison tool. It does NOT check against an internet database of billions of pages (like Turnitin). Instead, it compares "Text A" against "Text B" (e.g. your essay vs a known source) to calculate similarity percentage locally.
Similarity Score
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Measure how similar two texts are
Checking whether one piece of writing is too close to another is a common need, for teachers, editors and writers, and this tool compares two texts and calculates their similarity as a percentage, entirely in your browser. It is a direct comparison between the two documents you provide, not a search of the whole internet.
What this does and does not do
This compares the two specific texts you paste and reports how much they overlap, which is exactly right for checking a submission against a source, or two drafts against each other. It is not an internet-wide plagiarism scanner: it cannot tell you whether text was copied from somewhere you did not provide. Understanding that distinction matters, because the honest use is a two-document comparison, and the client-side processing means both texts stay private.
A private, direct comparison
Everything runs in your browser, so nothing you enter is uploaded and the tool works without an account. That keeps your study material and notes private on your own machine while you learn.
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Frequently Asked Questions
What does it compare?
The two texts you provide, calculating their similarity as a percentage. It is a direct comparison between them, not a search of the whole internet.
Can it detect plagiarism from any source?
No. It only compares the two texts you paste. It cannot tell whether text was copied from a source you did not provide, unlike an internet-wide scanner.
What is it good for?
Checking a submission against a known source, comparing two drafts, or measuring overlap between two documents you have.
Are my texts uploaded?
No. The comparison runs entirely in your browser, so both documents stay private on your machine.
How is the percentage calculated?
By measuring the overlap between the two texts, giving a similarity score for how much content they share.
Privacy & Security
Comparison happens locally. No text upload.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.