Free SEO Tool
Check a page's canonical tag, canonical URL, and HTTP canonical header in one report. Find duplicate declarations, missing canonicals, redirected canonical targets, and cross-domain canonical issues before they hurt indexing.
A canonical tag tells search engines which URL should be treated as the preferred version of a page. SeoMate's canonical checker follows redirects, reads the HTML head and HTTP headers, and compares the detected canonical URL against the final page URL so you can catch indexing conflicts quickly.
For a page at https://example.com/blog/post, a clean self-referencing canonical tag looks like this:
<link rel="canonical" href="https://example.com/blog/post" />
Search engines also support canonical hints in HTTP headers for non-HTML assets or advanced setups:
Link: <https://example.com/file.pdf>; rel="canonical"
Run a canonical check after publishing new templates, migrating URL structures, launching faceted navigation, or adding tracking parameters. Google's canonicalization documentation explains how canonical hints work, but this tool helps verify what your page actually returns.
Beyond canonical checks, SeoMate provides AI-powered content creation, keyword research, and multi-platform publishing to help you dominate search rankings.
Simply paste the full URL of the webpage you want to check into the input field above. Make sure to include the complete URL including https:// or http://. Our canonical check tool will fetch and analyze the page immediately.
Our canonical checker will scan both HTML head tags and HTTP headers to identify canonical declarations. You'll see a detailed report showing any issues like missing canonicals, conflicting declarations, or cross-domain references.
Follow the actionable recommendations provided in the report to fix any canonical tag issues. Common fixes include removing duplicate declarations, correcting self-referential loops, and updating cross-domain canonicals.
After implementing fixes, use our free canonical checker again to verify everything is configured correctly. Regular checks ensure your canonical setup stays optimized as your site evolves.
A canonical checker tests whether a page declares a canonical URL in the HTML head or HTTP headers and flags missing, conflicting, malformed, cross-domain, or redirecting canonical targets.
Enter the page URL and run the check. The report shows the detected rel=canonical tag, HTTP Link canonical header, final URL after redirects, and issues that may affect indexing.
Most indexable pages should use a self-referencing canonical tag so search engines understand the preferred URL, especially when tracking parameters, duplicate templates, or alternate paths exist.
Cross-domain canonicals are valid when intentional, such as syndicated content, but they can remove the checked page from search results if they point to the wrong domain.