Duplicate Content Checker
Find out how much two pages have in common. The checker fetches both pages, removes navigation, headers, footers and sidebars (optional), and compares the remaining text in overlapping runs of five words. It reports a similarity score, the share of each page that also appears in the other and the longest shared passages, and compares titles, meta descriptions, H1s and canonical tags. You can also compare two pasted texts.
- Encrypted connection
- No sign-up
- Free to use
How to use Duplicate Content Checker
- Enter the first and second page URL.
- Keep “Ignore navigation…” on for content only.
- Click “Compare pages”.
- Read the verdict and the shared passages.
Duplicate Content Checker features
Similarity score
Shared five-word runs.
Coverage
How much of each page is shared.
Shared passages
The longest matching text.
Page details
Title, description, H1, canonical.
Text mode
Compare two pasted texts.
Safe fetching
Only public http(s) addresses are fetched.
When to use Duplicate Content Checker
- Checking product variants or location pages.
- Finding copied content from another site.
- Comparing http/https or mobile URLs.
- Reviewing rewritten content against the original.
Duplicate Content Checker FAQ
Is duplicate content penalised?
Not as such. Search engines pick one version to show and filter the rest, so duplicates compete with each other. Deliberate copying to manipulate rankings is a different matter.
What similarity is too high?
Above about 80% the pages are near duplicates. Between 50% and 80% they share large sections; consider merging them or making each one distinct.
How should I fix duplicates?
Use a canonical tag pointing to the preferred page, a 301 redirect if one page is not needed, or rewrite the pages so each serves its own purpose.
Does it check the whole web?
No. It compares the two pages you enter. Searching the web for copies needs a search index.
What similarity is too high?
There is no official threshold. If most of the main text is shared, search engines will likely treat the pages as duplicates and show only one.
How much two pages have in common
Each text is split into words and every run of five consecutive words is compared. This “shingle” method finds shared passages even when they are surrounded by different text, and ignores word order beyond the five-word window.
Similarity is the share of all runs that appear in both texts. Coverage looks at each page separately: a short page copied entirely into a long one has 100% coverage but a lower overall similarity. The verdict uses the higher coverage.
Removing navigation and footers matters because templates repeat on every page; without it, two unrelated pages of the same site look more similar than they are.
The checker compares two pages by their text in overlapping runs of five words, which catches copied passages even when sentences are reordered. Navigation, headers, footers and sidebars can be removed first, so shared templates do not inflate the score.
It reports a similarity score, how much of each page also appears in the other, and the longest shared passages. That shows whether two pages are near-duplicates that compete with each other in search, or simply share a few phrases.
Near-duplicate pages on your own site are usually fixed by merging them, making each one clearly different, or pointing a canonical tag to the main version.