Duplicate Content Checker
Score phrase overlap, identical sentences and verbatim runs before duplicate pages split your rankings.
What this tool gives you
Compare two texts
Paste the original and the page to check. Analysis runs locally in your browser — nothing is sent anywhere.
What this checker looks for
Near-duplicate pages split ranking signals — one of them should earn the spot.
5-gram overlap
Shared phrase blocks reveal copied passages.
Identical sentences
Full copied sentences are the clearest flag.
Verbatim runs
12+ words in a row deserves a rewrite.
Unique vocabulary
Distinct pages bring their own words.
Thin inputs rejected
Under 20 words the score would mislead.
Local analysis
Texts never leave the browser tab.
How to use the checker
Paste both versions, then rewrite the shared passages first.
Paste both texts
Original on the left, page to check on the right — 20 words minimum each.
Read the overlap
Similarity carries the most weight, then identical sentences and verbatim runs.
Rewrite shared blocks
Change the angle and examples, not just synonyms — or canonicalize one page.
When overlap becomes a problem
Some shared boilerplate is normal — copied passages are not.
| Signal | Healthy range | Why it matters |
|---|---|---|
| Phrase overlap | Under 15% | Distinct pages share few 5-word blocks. |
| Identical sentences | Zero | Full copied sentences are the clearest duplicate flag. |
| Verbatim runs | Under 12 words | Long copied runs mean a lifted passage. |
| Unique vocabulary | 60%+ unique | Distinct pages bring their own words and angles. |
| Fix strategy | Rewrite or canonical | Merge, differentiate, or point a canonical at the winner. |
Related GEO pages
Deduplicate first, then strengthen what each page says.
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Keyword Density Checker
Score top-term density, stuffing risk and title keyword overlap.
Readability Checker
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Tools Lab
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Duplicate content FAQs
What counts as duplicate content?
Substantive blocks of identical or near-identical copy across pages — full sentences or passages, not single shared phrases. This tool flags 5-gram overlap, identical sentences and verbatim runs.
How much overlap is too much?
Under 15% phrase overlap reads as distinct; 15-35% means shared boilerplate worth rewriting; over 35% risks search engines treating the pages as duplicates and splitting ranking signals.
Is this a plagiarism checker?
It compares the two texts you paste against each other — it does not search the web. Use it to catch accidental duplication between your own pages before publishing.