What this tool does
Canonical URL Checker reviews canonical URL signals and common canonicalization issues.
← All Tools
🔗 Canonical URL Checker
Paste page HTML and audit canonical URL tags, duplicates, and common SEO issues.
Why it is useful
It helps site owners catch duplicate-content, wrong-canonical, trailing-slash, protocol, and domain consistency problems.
How it works
The tool inspects pasted or provided page data and reports canonical URL shape and likely issues.
Best input
Use the final production URL and rendered canonical tag from the page you want indexed.
SEO tip
Canonical URLs should be absolute, stable, indexable, and point to the preferred version of the content.
Privacy note
Manual checks happen locally. Live URL fetching, if available, requires a network request for the URL being checked.
Important limitation
Canonical tags are hints, not commands. Search engines may choose a different canonical if signals conflict.
Quick answers
Should canonicals be absolute?
Yes. Absolute canonical URLs are clearer and less error-prone.
Can canonical tags fix thin pages?
No. They help consolidate duplicates, not improve content quality.
Common Use Cases
Check deployed page source
Paste HTML from View Source to confirm a canonical tag exists and points to the preferred URL.
Find duplicate canonical tags
Catch template mistakes where multiple SEO plugins or layouts emit competing canonical URLs.
Prepare SEO QA notes
Copy a concise canonical report into a ticket, PR, or audit document.
SEO Suite workflow
Move from pasted page metadata into canonical, heading, link, keyword, page-size, Core Web Vitals, SERP snippet, social-card, and meta-description checks while keeping local-analysis boundaries clear.