Canonical Tag Checker
Check a URL or paste a page's HTML source to see its canonical tag (or tags), whether it's missing or duplicated, and whether it points somewhere unexpected.
Most third-party sites block this kind of direct cross-origin request. If fetching fails, switch to "Paste source instead".
About this tool
Checks a page's <link rel="canonical"> tag for missing, multiple, or unexpectedly different canonical URLs.
How to use it
- Enter a page URL and click Fetch & Analyze, or paste the page's HTML source.
- Read the status and canonical URL found.
- Review any flagged issues and recommendations below.
FAQ
What is a canonical tag?
A <link rel="canonical" href="…"> tag tells search engines which URL is the preferred, authoritative version of a page when the same or very similar content is reachable at more than one URL (for example with and without tracking parameters).
Does a canonical tag guarantee that page will be indexed?
No. A canonical tag is a strong hint, not a directive search engines are required to follow — they can and sometimes do choose a different canonical URL if other signals point elsewhere.
Why would a canonical point to a different page?
This is often intentional — for example, a filtered or paginated version of a listing page canonicalizing to the main listing. It becomes worth investigating only when it looks unintentional.
What if there are multiple canonical tags?
A page should declare at most one canonical URL. Multiple, possibly conflicting canonical tags force search engines to guess which one to trust, which this tool flags as a critical issue.
Should the canonical URL be absolute or relative?
An absolute URL (including https:// and the full domain) is the safer, unambiguous convention. This tool resolves a relative canonical against the page URL for its analysis but flags it as worth fixing.
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