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.

Free SEO analysis No sign-up required Instant results

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
Input Text Output Report Browser-only No upload by default

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

  • JavaScript-rendered content is not evaluated. Only the static HTML response is analysed.
  • Paste the raw HTML source. Relative paths may not resolve correctly without the original base URL.
  • Missing canonical tags are flagged as warnings.
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.

Does Canonical URL Checker upload my data?

Your file or text is processed in your browser and is not uploaded.

What does Canonical URL Checker check?

It produces a canonical URL report. Missing canonical tags are flagged as warnings.

Does this replace Google Search Console?

No. This tool reads static HTML and provides a quick informational check. For authoritative indexing data and crawl reports, use Google Search Console.