About The Text Similarity Checker

The Text Similarity Checker compares two pasted text blocks and reports overlap using set-based similarity scores. It is useful for comparing drafts, summaries, release notes, support responses, documentation snippets, or short content variants.

Comparison runs locally in your browser. Word mode compares unique word tokens, while character 3-gram mode compares short overlapping character sequences after whitespace normalization.

How to Compare Text Similarity Online

1. Paste the first text into Text A.
2. Paste the second text into Text B.
3. Choose Word token set or Character 3-grams.
4. Click Check Similarity and review the Jaccard and Dice scores.

Choosing Options Correctly

Word token set:
- Use this for normal document, article, and support-copy comparisons.
- It is easier to interpret because the counts are based on unique words.

Character 3-grams:
- Use this for shorter strings, partial wording overlap, or copy with small spelling differences.
- It can show similarity even when exact words differ slightly.

Common Use Cases

• Compare two versions of a paragraph or release note.
• Check whether a support reply is too similar to a template.
• Compare summaries written from the same source material.
• Estimate overlap before doing a manual content review.

Quick FAQ

Is this a plagiarism detector?
No. It compares text similarity and does not search the web, prove originality, or identify sources.

Does pasted text leave my browser?
No. Similarity scoring is designed to run in the browser.

Why do the scores differ?
Different algorithms compare words, characters, order, or vector overlap differently, so scores are not universal.

What should I compare with it?
Use it for drafts, rewrites, duplicate snippets, or rough overlap checks, then review the text manually.