SEO Tools

Canonical URL Checker

Inspect the `rel=canonical` link tag on any public URL. Verifies whether a canonical tag is present, whether it self-references correctly, or points cross-domain, helping diagnose duplicate content and indexing issues.

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Validate your canonical tag

Inspects the canonical link tag, detects self-referential canonicals, protocol/www mismatches, og:url conflicts, and validates the canonical chain — with fix suggestions.

Never stored canonical tag og:url check protocol/www mismatch

Features

  • Reads <link rel='canonical'> from page HTML
  • Checks whether canonical is self-referencing or pointing elsewhere
  • Flags cross-domain canonicals
  • Compares canonical URL to the requested URL
  • Identifies missing canonical tags
  • Fetches public URLs only, SSRF-protected

How to use it

  1. Enter the public URL to check.
  2. The tool fetches the HTML and extracts the canonical tag.
  3. See the canonical URL and status (self, cross-domain, missing).
  4. Review the explanation and recommendation.

Use cases

  • Verifying canonical tags after a site migration
  • Diagnosing duplicate content issues in search consoles
  • Checking cross-domain canonicals for syndicated content
  • Auditing canonical consistency across paginated pages

Limitations

  • Only one canonical tag per page is read, if multiple canonical tags exist, the tool reads the first and flags the duplicate.
See also

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Questions & answers

Frequently asked

What is a self-referencing canonical?

A canonical tag where the href equals the current page URL. This tells search engines this is the authoritative version and suppresses potential duplicate content signals.