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Canonical Tag Checker

SEO Tools

Check canonical tags on any webpage to prevent duplicate content issues.

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What Canonical Tag Checker does

The Canonical Tag Checker reads the HTML you paste and shows the page's <link rel="canonical"> tag: the URL it points to, whether it is absolute, and whether it matches the page URL you enter. It also flags a missing tag, multiple canonical tags and a canonical placed outside <head>, the mistakes that make Google ignore the hint.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use Canonical Tag Checker

  1. View your page source (Ctrl+U) and copy the HTML
  2. Paste it into the box and, optionally, enter the page's own URL
  3. Click Check canonical
  4. Read the canonical target and any warnings, and fix them in your template

Who should use it

Made for marketers and seo. Typical uses:

  • Verifying a migrated site's pages canonicalize to the correct new URLs
  • Checking that paginated or filtered product listing pages point to the right canonical version
  • Confirming a page doesn't have a canonical tag accidentally pointing to the wrong domain

Limitations and accuracy

It reads the HTML you paste and does not fetch live URLs, follow redirects or confirm that the canonical target loads. Canonicals set in HTTP headers are not visible in pasted HTML.

Accuracy: Results show what the tool can measure at the moment you run it and can differ from what search engines see. Use them as guidance.

Frequently asked questions

What does it mean if a page has no canonical tag?
Google chooses the preferred URL itself, which can go wrong when the same content is reachable at several addresses (with tracking parameters, filters or www and non-www). A self-referencing canonical on every page is the safe default.
Should the canonical point to the page itself?
For most pages, yes. Only duplicates (filtered, print or tracking-parameter versions) should point to a different, main URL. Enter the page URL to check this.
Can a canonical point to another domain?
Yes, cross-domain canonicals are allowed, for example when you syndicate content. The checker shows the target so you can confirm it is intentional.
Does it check my whole site?
No, one page of pasted HTML at a time.

Learning resources

Explore more in SEO Tools, read the guides and articles, or see how we test our tools.

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