Canonical URL Checker

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.

Use canonical tags when the same content is accessible at multiple URLs (e.g., with/without www, HTTP/HTTPS, URL parameters). Point all variations to the preferred version.

Yes, cross-domain canonicals are supported. This is useful when content is syndicated across multiple sites — point the canonical to the original source.