Text Similarity Checker
Compare two texts online for free: Levenshtein, Jaccard and cosine similarity percentages plus a word-level diff showing which words appear only in one text - entirely client-side.
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What is Text Similarity Checker?
The Text Similarity Checker compares two texts with three standard metrics: Levenshtein edit distance relative to the longer text, Jaccard similarity on word sets, and cosine similarity on word frequency vectors. A word-level diff highlights words unique to each text, and all scores update live as you type.
Key Benefits
- Three independent metrics instead of one opinion
- Word-level diff shows exactly what changed
- Instant scores as you type or paste
- Works for spelling, vocabulary and phrasing differences
- Private and instant - everything runs in the browser
Common Use Cases
- •Checking paraphrases against source text
- •Comparing translations or localized copy
- •Auditing repeated content across documents
- •Reviewing edits between two versions of a draft
How to Compare Text Similarity
- Paste both texts: Put the first text into text A and the second into text B.
- Read the scores: See Levenshtein, Jaccard and cosine similarity percentages instantly.
- Inspect the diff: Check which words appear only in text A or only in text B.
- Refine and repeat: Edit either text and watch all three scores update live.
Key Features
- Levenshtein similarity relative to the longer text
- Jaccard similarity on word sets
- Cosine similarity on word frequency vectors
- Word-level diff of words unique to each text
- Instant scores as you type or paste
- No upload - all comparison runs client-side