Free SEO Tools
Canonical Checker
Enter a URL to see its canonical tag and whether it's missing, duplicated, relative, or points at another domain — fetched live, free, no signup required.
What this checks
This tool fetches the page and reads every <link rel="canonical"> tag, comparing it against the URL you requested. Not every difference is a mistake — some sites deliberately canonicalize to a different path or domain, so these are shown as review flags, not hard failures.
Frequently Asked Questions
- What is a canonical tag?
- A <link rel="canonical"> tag that tells search engines which URL is the preferred version of a page when duplicates or near-duplicates exist.
- What issues does this tool flag?
- A missing canonical, a canonical pointing to a different URL than the one you checked, and other common misconfigurations.
- Should every page have a canonical tag?
- It's a common best practice, especially for pages reachable via multiple URLs, but not a strict requirement for every single page.