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Duplicate Content Checker
Compare two pages and find the passages they share.
Quick Tool Overview
The Duplicate Content Checker compares two pieces of content using overlapping word sequences rather than a crude word count, reports a similarity percentage, and highlights the passages that appear in both. It is clear that duplicate content is not penalised — what happens is that Google picks one version and drops the rest.
- What it does
- Measures how much two pieces of content share
- You give it
- Two texts, as plain text or HTML
- You get back
- A similarity score and the shared passages highlighted
- Best for
- Location pages, product variants and templated copy
About the Duplicate Content Checker
Paste two pieces of content and the checker measures how much they share, using overlapping word sequences rather than a crude word count. The passages that appear in both are highlighted in place, so you can see exactly where the duplication is.
It is worth being precise about what duplicate content does. There is no duplicate content penalty, and Google has said so repeatedly. What happens instead is quieter and often worse: Google picks one version to index and drops the others, and the one it picks may not be the one you wanted. Two near-identical location pages, or a category page whose text is repeated across every variant, end up competing with each other for the same query and neither wins. This tool tells you how close two pages are; what you do about it is a canonical, a rewrite, or a merge.
Key features of the Duplicate Content Checker
Shingle-based similarity
Overlapping word sequences catch reordered and lightly reworded copy that a word count misses.
Shared passages listed
The exact runs that appear in both are shown, so you know what to rewrite.
HTML stripped first
Paste raw markup and the comparison runs on the readable text, not the tags.
Unique-to-each view
What only appears in one side is separated out, which is what makes each page worth keeping.
Plain about the consequences
No penalty myth — it explains that the real cost is Google choosing for you.
How to use the Duplicate Content Checker
-
1
Paste the first version
Plain text or HTML — tags are stripped before the comparison.
-
2
Paste the second
The other page, template output or draft you want to compare it against.
-
3
Read the similarity score
Shown as a percentage, with the shared passages listed and highlighted.
-
4
Decide what to do
Rewrite, canonicalise or merge, depending on whether both pages need to exist.
Frequently asked questions
No. Google has said so many times. What actually happens is that Google chooses one version to index and filters the others out of results, and it may not choose the one you wanted. The damage is dilution, not punishment.
There is no threshold Google publishes. As a working rule, two pages sharing most of their substantive text will be treated as the same page, and two pages sharing boilerplate but differing in their real content will not. If you cannot explain why both need to exist, that is the answer.
Common in ecommerce and usually handled with canonicals to a single main version, or by writing enough unique text around the shared description to make each page substantially different. Manufacturer descriptions copied verbatim across a whole market are the classic case of pages that rank for nothing.
No, and nothing that runs in a browser could. It compares two pieces of text you supply. For checking against the web you need a service with an index of it, which is a fundamentally different tool.
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