Canonical URL Checker
Check canonical tags on your web pages to prevent duplicate content issues and improve SEO
• Checks are performed in batches to avoid overloading servers
• Some websites may block automated requests
• CORS restrictions may prevent checking some URLs
No URLs added yet. Add some URLs to start checking canonical tags.
About Canonical URLs
What are canonical URLs?
Canonical URLs tell search engines which version of a page is the "master" copy when you have multiple pages with similar or identical content.
Why are they important?
They prevent duplicate content penalties, consolidate link equity, and help search engines understand your preferred page structure.
Common issues
Missing canonical tags, relative URLs instead of absolute, canonical chains, and HTTPS/HTTP mismatches can harm SEO.
Self-referencing
Unique pages should have self-referencing canonical tags to explicitly declare themselves as the canonical version.
Best Practices
What This Tool Checks
- • Presence of canonical tags
- • Self-referencing canonical validation
- • HTTPS vs HTTP canonical URLs
- • HTTP status codes of canonical URLs
- • Redirect chains in canonical URLs
- • Relative vs absolute URL formats