Paste two pieces of text to see how similar they are and which sentences are copied or nearly copied.
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How similarity is measured
Both texts are broken into overlapping four-word phrases. Similarity is the share of phrases the two texts have in common. Short phrases like “the” or “and the” don’t count, so reordering a few words won’t hide copying, but genuine rewriting will lower the score.
| Score | Meaning |
|---|---|
| Under 25% | Mostly unique |
| 25% to 60% | Partly duplicate: some shared passages |
| Over 60% | Mostly duplicate |
Does duplicate content hurt SEO?
Google doesn’t penalise duplicate content in general. But when pages are near-identical, it picks one to show and filters the others, so your pages can end up competing with each other or with other sites using the same supplier text.
- Rewrite manufacturer descriptions in your own words.
- Use canonical tags when similar pages must exist, like product variants.
- Combine thin, similar pages into one stronger page.
Frequently asked questions
Does this search the web for copies?
No, it compares the two texts you paste.
What similarity is acceptable?
For pages you want to rank separately, aim for under 25%.
Is duplicate content a penalty?
Not usually, unless it’s scraped or deceptive. It mainly affects which version Google shows.
Are my texts stored?
No, they’re compared in your browser.
Sources
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