Text Similarity Checker
Compare two texts for overlapping phrases -- not a web-search plagiarism checker
This compares the two texts you paste below against each other only — it has no connection to the internet or any academic database, so it cannot tell you whether your writing matches something published elsewhere. Use it to compare your draft against a specific source you're citing, or two of your own drafts — not as a substitute for your school's actual plagiarism-detection tool.
38.7%
of your text shares 6+ word phrases with the comparison text
What is this tool?
Compares two texts you provide against each other and highlights overlapping phrases with a match percentage — a text comparison tool, not a web-search plagiarism checker, since it has no connection to the internet or any academic database.
How to use it
Paste your text and the text you want to compare it against, and the overlapping phrases are highlighted automatically with a match percentage shown.
Use this to compare your draft against a specific source you're citing, or two of your own drafts — it's not a substitute for your school's actual plagiarism-detection tool, which checks against a much broader database.
Watch: Text Similarity Checker in Action
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Frequently asked questions
How to use Text Similarity Checker
Paste your first text into one panel and the text you want to compare it against into the second. The tool analyzes both and highlights matching or closely overlapping phrases between them, along with an overall match percentage showing how much of the text overlaps. This is a direct, two-text comparison -- it only ever compares exactly the two texts you provide against each other, nothing more.
When to use it
Useful for comparing your own draft against a specific source you're citing or referencing, to check how much of your wording overlaps with the original before you submit or publish something -- catching accidental over-reliance on a source's exact phrasing before it becomes a problem. It's also useful for comparing two versions of your own writing (an early draft against a revision, for instance) to see concretely how much actually changed between them, beyond just a general sense that "it's different now."
When not to use it
This is explicitly not a substitute for an academic plagiarism-detection service -- it has no connection to the internet or any academic database, and only ever compares the two specific texts you paste in against each other. If you need to check a paper against a broad database of published academic work, web content, or other students' submissions (the kind of check a university's plagiarism software performs), this tool genuinely can't do that -- it can only tell you about overlap with a specific source you already have and paste in yourself.
Tips for best results
For checking overlap with a specific published source, copy the exact passage you're concerned about rather than the source's entire article or paper -- comparing focused, relevant excerpts against your own draft gives a more meaningful match percentage than comparing your whole draft against an entire unrelated source document with mostly non-overlapping content.
Limitations
Because it only compares exactly two texts you provide, it can't catch similarity to any source you don't already have in hand to paste in -- if the concern is unknown or undiscovered overlap with something you haven't specifically checked against, this tool won't surface that the way a database-backed plagiarism checker would.
Privacy
Both texts are compared entirely in your browser -- neither text is uploaded to any server or external database, which also means neither text is added to any database other tools or services could later match against.
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