Duplicate Content Detector
Compare two texts or pages and measure similarity with shingle and cosine analysis.
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About this tool
Duplicate and near-duplicate content wastes crawl budget and splits ranking signals. Paste two texts (or fetch two URLs) to get an exact similarity percentage using word-shingle overlap and cosine similarity, with matching passages highlighted.
How to use the Duplicate Content Detector
- Paste or fetch the two pieces of content.
- Run the comparison to get similarity scores.
- Rewrite or canonicalize pages that overlap heavily (over ~30%).
Frequently asked questions
How much similarity is a problem?
Boilerplate overlap is normal; body content above ~30–40% similar deserves a rewrite or a canonical tag.
Is there a duplicate content penalty?
Not a penalty per se — but Google filters duplicates from results, so only one version wins.