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Text Similarity Checker

Compare two texts with Levenshtein distance, Jaccard, cosine and Dice coefficients.

Text similarity can be measured several ways, and they disagree usefully. Levenshtein counts character edits, Jaccard and Dice compare shared vocabulary, and cosine compares word-frequency vectors while ignoring length. This tool reports all four so you can see whether two texts are reworded, reordered or genuinely different.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Which measure should I trust?

It depends what you mean by similar. Levenshtein catches typos and small edits; cosine spots the same content reordered; Jaccard is best for checking whether two documents cover the same topic regardless of phrasing.

Is this a plagiarism checker?

No. It compares two texts you supply against each other. Plagiarism detection requires searching a corpus of billions of documents, which no browser tool can do.

How to use the text similarity checker

  1. 1Enter or paste your first text.
  2. 2Enter or paste your second text.
  3. 3The result appears immediately — copy or download it.

Embed this tool

Put the working text similarity checker on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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