SEO Tools
Duplicate Content Comparator
Compare two supplied texts and highlight identical or near-identical passages.
Powering up the tool…
What this tool does
About the duplicate content comparator
The browser calculates token and sentence similarity only between the two versions you paste. It does not search the public web for copies.
How to use it
- Paste version A and version B.
- Read the similarity score and the highlighted matched passages.
- Decide: merge the pages, differentiate one, or canonicalise one to the other.
- Re-run after editing to confirm the overlap dropped where you wanted it to.
Useful for
- Check how far a rewrite actually diverged from the original before republishing.
- Compare two of your own pages that might be competing for the same query.
- Verify supplied copy is not a light shuffle of an existing page you already have.
Straight answers
Duplicate Content Comparator FAQ
Is there a duplicate-content penalty?
Not a penalty as such — Google just picks one version and filters the rest, which feels the same when it picks wrong. Internal near-duplicates are consolidation work, not punishment.
What similarity score is “too similar”?
There is no official line. In practice, two pages sharing most of their shingled passages will struggle to rank separately; the highlighted matches matter more than the single number.
Does this search the web for copies?
No — it compares only the two texts you paste, locally. For web-wide plagiarism you need a crawling service; this tool is the private, instant half of the job.