Canonical Tag Checker
Canonical Tag Checker
Check canonical URLs, detect duplicate canonical tags, identify redirects and discover technical SEO issues.
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Frequently Asked Questions
A canonical tag is an HTML element (link rel="canonical") that tells search engines which URL is the preferred version of a page when multiple URLs have similar or identical content.
Canonical tags prevent duplicate content penalties by telling search engines which URL to index and rank. Without a proper canonical tag, search engines may split ranking signals across multiple URLs.
No. Having multiple canonical tags creates conflicting signals for search engines. Only one canonical tag should exist per page.
Yes. If your site uses HTTPS, the canonical URL should also use HTTPS. Mixed protocol sends inconsistent signals.
No. The canonical tag should point directly to the final preferred URL that returns HTTP 200.
No. A canonical tag is a suggestion to search engines. A redirect (301/302) actually sends users and bots to a different URL.
No. A canonical tag is a signal, not a directive. Search engines may choose a different canonical URL based on other signals.
Important Note
This tool checks publicly accessible HTTP/HTML signals from the submitted URL. It cannot reproduce Google's complete indexing or canonicalization systems. Search engines may choose a different canonical URL based on additional signals.