Text Similarity Checker
Compare two texts and calculate their similarity percentage. Free text similarity checker — detect paraphrasing and near-duplicates.
Three steps to get started
Paste both texts
Add your first and second text in the two input fields. They can be any length.
See similarity instantly
The similarity percentage, common word count, and total unique word count update live.
Interpret the result
Above 70% is Very Similar, 40–70% is Somewhat Similar, below 40% is Different.
Compare any two texts in seconds
The Text Similarity Checker lets you compare any two pieces of text and calculate how similar they are based on shared vocabulary. It is useful for writers, content editors, students, and developers who need to quickly gauge how much overlap exists between two documents.
How it works: The tool uses the Jaccard similarity index, a standard mathematical measure of set overlap. It tokenizes each text into unique words, finds the intersection (shared words), and divides by the union (all unique words across both texts). The result is expressed as a percentage — 0% means no shared words, 100% means identical vocabulary.
Content comparison: Use it to compare two versions of the same document to verify how much has changed. Compare a draft to a published version, or compare content from two different sources to check for unintentional duplication.
Paraphrase detection: Paraphrased text typically retains many of the same key nouns and domain-specific terms even when sentence structure changes. A high similarity score on two supposedly independent pieces may flag them for closer manual review.
Research and education: Students and researchers can use this tool to check that summaries and paraphrases are sufficiently distinct from the source material. It also helps editors ensure that updated articles are genuinely new content rather than recycled text.
All processing is entirely in-browser. Your texts never leave your device, and the comparison runs in real time as you type.