Free duplicate content checker
Enter two URLs to see how much wording they share. Navigation, headers and footers are stripped first, so the score reflects the actual content rather than the template — and the shared passages are shown as evidence for the number.
There is no penalty. There is something worse.
The phrase “duplicate content penalty” describes something that does not exist. Google does not demote a site for having similar pages. What it does is choose: when two URLs carry substantially the same content, it indexes one and drops the other.
That is worse than a penalty in one specific way — a penalty is visible, and this is not. The dropped page returns nothing when you search for its exact title, gets no traffic, shows no error anywhere, and looks perfectly healthy when you visit it. You lose a page and receive no notification that anything happened.
Why the template is excluded
Two pages from the same site share their header, navigation, sidebar and footer, which on many sites is more markup than the article itself. A character-level comparison would call two completely unrelated pages 80 percent identical on that basis alone, and the number would be useless.
This tool removes <nav>, <header>, <footer> and <aside> before comparing, then measures shared three-word sequences in what is left. Three words is short enough to catch reworded passages and long enough that common phrasing does not register as copying.
Reading the result
Identical titles are flagged as a failure: two pages claiming to be the same thing will compete for the same query, and Google has to pick one. Identical descriptions are a warning — they cost clicks rather than indexing. A shared canonical is reported as a pass, because that is the correct fix already in place: both pages agree on which URL is authoritative, and Google is being told exactly what to do.
Where this bites hardest is e-commerce with product variants, location pages built from one paragraph with the town name swapped, and printer-friendly or AMP versions of an article. In each case the pages exist for a reason and the answer is a canonical, not deletion.
What this tool cannot tell you
It compares two URLs you already suspect. It cannot find duplicates you have not thought of, and it cannot detect content copied onto sites you do not know about. It also reads the HTML as served — a page that builds its content in the browser with JavaScript will look nearly empty to it, which the tool says rather than reporting a misleading zero.
To find duplicate titles and descriptions across a whole site rather than between two known pages, the free website audit crawls multiple pages and reports collisions along with everything else that affects indexing. If you are working through a page that has vanished from search, start with the indexability checker.
Duplicate content questions
- Is there a duplicate content penalty?
- No. Google has said repeatedly that there is no duplicate content penalty. What actually happens is selection: Google picks one URL to index and drops the other. Nothing is punished — one of your two pages simply stops existing as far as search is concerned, which is why the effect gets mistaken for a penalty.
- How much duplicate content is too much?
- There is no published threshold, because Google decides per case rather than by percentage. As a working rule, under 60 percent shared wording is normal for pages in the same template, 60 to 85 is worth a look, and above 85 the two pages are effectively the same page and one of them will be dropped.
- How does this tool measure similarity?
- By comparing shared three-word sequences in the body text, after stripping the navigation, header, footer and sidebars. A character-level diff would report two pages from the same template as almost identical when only the chrome is shared — measuring phrasing is closer to what a search engine is deciding about.
- What is the fix for duplicate pages?
- Pick which URL should be the real one and put a canonical tag on the other pointing to it. If neither should exist separately, merge them and 301 redirect the loser. If both need to stay and both need to be indexed, the answer is not a tag — it is rewriting one of them so they are genuinely different.
- Do identical title tags matter?
- Yes, more than people expect. Two pages with the same title are competing for the same query with the same claim, and the title is one of the strongest hints Google has about what a page is for. Identical titles across a set of pages usually means a template that never filled in the variable.
- Does syndicating my content hurt me?
- Syndicating your content can hurt you if the syndicating site outranks you for your own article. The convention is for the republishing site to use a canonical tag pointing at your original, or at minimum a visible link to it. Without one, the stronger domain often wins the copy, which is your article ranking on somebody else's site.
- Does duplicate content hurt SEO?
- Duplicate content rarely causes a penalty, but it does hurt SEO by splitting signals and forcing Google to pick one version to rank while ignoring the rest. The real cost is diluted authority and unpredictable results, which you fix by consolidating with a canonical tag or a redirect rather than fearing a penalty.
- What is considered duplicate content?
- Duplicate content is a substantial block of text that is identical or very similar across more than one URL, whether on the same site or across sites. Common sources are printer-friendly pages, URL parameters, www and non-www versions, and product descriptions copied from a manufacturer.
- How does duplicate content affect search rankings?
- When several URLs carry the same content, Google groups them and usually shows only one, so links and relevance spread across the copies instead of concentrating on a single strong page. The result is that none of them ranks as well as a single consolidated version would.
- Is duplicate content across my own pages a problem?
- Internal duplication is common and usually fixable rather than dangerous, but it does confuse which page should rank and wastes crawl budget on redundant URLs. Point duplicates at one preferred version with a canonical tag, or merge them, so the authority lands on a single page.
- How do I check if my content has been copied by another site?
- Paste a distinctive sentence from your page into Google in quotation marks to see which other pages contain it word for word. If a scraper outranks you for your own text, the fix is usually to strengthen your page's authority and internal links rather than to remove the original.