Canonical URL Checker
FreeValidate canonical tags and detect duplicate content issues
canonicalurlduplicateseo
All SEO ToolsRelated tools
How it works
1
Enter
Type or paste the URL you want to check for canonical tag implementation.
2
Inspect
Review the detected canonical URL, whether it is self-referencing, and any conflicts with other signals.
3
Resolve
Follow the recommendations to fix missing, mismatched, or conflicting canonical declarations.
Frequently asked questions
What is a canonical URL?+
A canonical URL tells search engines which version of a page is the original when duplicate or similar content exists at multiple URLs. It prevents duplicate content issues and consolidates ranking signals to one preferred URL.
When should I use a canonical tag?+
Use canonical tags when the same content is accessible at multiple URLs, such as with query parameters, www versus non-www, or HTTP versus HTTPS. Also use them for syndicated content to point back to the original source.
What happens if my canonical URL points to a different page?+
Search engines treat the target URL as the authoritative version and may drop the current page from results. Make sure the canonical points to the correct preferred URL or is self-referencing when the current page is the original.
Does this tool check the URL locally?+
The canonical tag parsing and validation logic runs in your browser. The tool fetches the target page to read its head section, but no data about your pages is stored or sent to third-party servers.
Can a page have multiple canonical tags?+
No. Having more than one canonical tag confuses search engines and they may ignore both. The checker flags pages with multiple canonical declarations so you can remove the duplicates.