✓ TF-IDF cosine✓ Jaccard index✓ Free forever

Free Text Similarity Checker

Compare two texts and measure similarity using multiple algorithms.

Text A

Text B

Cosine (TF-IDF)

29%

Jaccard Index

50%

Overlap Coefficient

Shared words (8)

machine, learning, artificial, intelligence, learn, from, data, to

Only in A (12)

is, a, branch, of, that, focuses, on, building, systems, improve, their, performance

Only in B (8)

includes, which, enables, computers, without, being, explicitly, programmed

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No pressure — the tool is free forever either way.

How to use Text Similarity Checker

Three steps. Instant results.

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Step 1

Paste the first text document into the left text area.

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Step 2

Paste the second text document into the right text area.

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Step 3

The tool instantly calculates similarity scores across three algorithms and highlights shared/unique vocabulary.

How Text Similarity Checker works

Uses three complementary algorithms: TF-IDF Cosine Similarity weights words by importance (rarer words matter more) and measures the angle between document vectors. Jaccard Index measures the ratio of shared unique words to total unique words. Overlap Coefficient measures what fraction of the smaller text's vocabulary appears in the larger text. Together, these give a well-rounded view of text similarity. All processing happens locally in your browser.

Why use this Text Similarity Checker?

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Uses 3 different math models for accuracy

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Highlights unique and shared vocabulary

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Updates instantly as you type

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100% private, client-side processing

Frequently asked questions

How does the similarity checker work?

It uses three algorithms: TF-IDF Cosine Similarity (weights rare words higher), Jaccard Index (ratio of shared words to total unique words), and Overlap Coefficient. Together, they provide a well-rounded similarity score.

Is my text data safe?

Yes. All processing is done client-side in your web browser. Your text is never sent to a backend server, ensuring complete privacy.

Can it detect plagiarism?

While it can highlight shared vocabulary and identical phrasing, it does not search the internet for matching content. It only compares the two texts you provide.

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