Free tool
Canonical URL Checker
Check any page's canonical tag in seconds. Spot missing, duplicate, relative or mismatched canonicals that quietly hurt how Google indexes your site.
Checking the page…
Reading the canonical tag.
Page checked
Canonical found
How to use it
Paste in the full address of a page and run the check. The tool fetches that page on our server and reads its canonical tag, the small piece of code that tells Google which version of a page is the main one to index.
You will see the canonical it found, or a clear flag if there is none. Each result is marked green, amber or red so you can spot trouble at a glance: a missing tag, more than one tag on the same page, a relative address that should be absolute, or a canonical that points at a different URL than the one you checked.
Canonicals matter because the wrong one can quietly take you out of search results. If a page points its canonical at another URL, Google may index that page instead of yours and drop yours from results. Conflicting or missing canonicals can also split your ranking signals across near-duplicate pages, so neither version performs as well as it should.
As a rule, each page should have one self-referencing canonical pointing at its own clean address. If this tool flags something you did not expect, it is worth fixing before it costs you visibility.
Frequently asked questions
What is a canonical URL?
A canonical URL tells search engines which version of a page is the main one to index when similar or duplicate versions exist. It is set with a link rel canonical tag in the page head.
Why does a wrong canonical hurt my SEO?
If a page points its canonical at the wrong URL, search engines may index that other page instead and drop yours. Missing or conflicting canonicals can also split ranking signals across duplicate pages.
Should every page have a canonical tag?
It is good practice for each page to have a self-referencing canonical pointing at its own clean URL. That removes ambiguity and protects you against duplicate content from things like tracking parameters.
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