Duplicate Content Checker

A duplicate content checker compares two pieces of text and reports how many phrases they share. Use it to spot near-copies across your own pages or against a source before publishing.

It runs entirely in your browser. Nothing you paste or upload is sent to a server or stored.

How to read the result and act on it

The result shows how much phrasing two texts share, so use it to spot near-copies across your own pages or between a draft and a source. Look at the shared phrases themselves, not just the percentage: long matching sentences are a stronger signal than a few common expressions. If your own pages overlap heavily, decide whether to merge them, differentiate their purpose, or point one to the other with a canonical tag or redirect. If a draft matches another source, rewrite it from your own notes and add original information instead of swapping words. Re-run the comparison after revisions, and keep boilerplate such as disclaimers separate so it does not inflate the similarity.

Common mistakes to avoid

Do not treat a low percentage as proof of originality, since two texts can differ in wording yet add nothing new. Likewise, shared product specifications or legal text can produce high overlap that is perfectly normal. Another mistake is rewording sentences just to pass a check; the aim is to add something useful, such as experience, data or a clearer explanation. Avoid comparing full pages including menus and footers, which inflates the match. Remember that the tool only compares the two texts you provide, so it cannot tell you whether the same content exists elsewhere on the web or whether a search engine considers it a duplicate.

Does Google penalise duplicate content?

Usually no. Google tends to pick one version to show. Large-scale copying meant to manipulate results can be treated as spam.

How similar is too similar?

There is no fixed threshold. If two of your pages answer the same query with nearly the same text, merge or differentiate them.

How do I fix duplicate content on my own site?

Merge or redirect overlapping pages, use canonical tags where near-identical versions must exist, and rewrite pages so each has a distinct purpose. Check URL variants, such as parameters and trailing slashes, as well.

What is a canonical tag?

A canonical tag is a link element that names the preferred URL among similar pages. It signals which version to index, though search engines treat it as a hint and may choose differently.

• Keyword Cannibalization Checker: Upload a Search Console query and page export to find queries where several of your pages compete.
• Semantic Term Gap Finder: Compare your text with competitor text to find phrases they use that you do not.
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