* Canonical Tag Checker
Canonical Tag Checker: Fix duplicate content.
Free canonical tag checker. We verify the canonical tag on every page in your sitemap, detect chains, protocol mismatches, and conflicting canonicals that hurt SEO.
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Common questions
What does the canonical tag checker do?
We verify that every page in your sitemap has a correct canonical tag pointing to itself - the #1 source of duplicate content penalties.
How do you detect canonical conflicts?
We flag pages with canonical tags pointing to other URLs, canonical chains, protocol mismatches (HTTP vs HTTPS), and trailing slash inconsistencies.
Why are canonical tags important for SEO?
Google uses canonical tags to pick which version of a page to index. Wrong canonicals cause the wrong page to rank or no page to rank at all.