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Canonical URL Checker

Verify a page's canonical tag — self-referencing, missing, or duplicated.

Sends the page URL to our server for this checkNo sign-up required

One Tag, Easy to Get Wrong

The canonical tag is a single line in a page's head, but getting it wrong — missing, duplicated, or pointing somewhere unexpected — can quietly cause duplicate-content issues in search results. This tool fetches the page and reports exactly what it finds.

How to Use This Tool

  1. 1Paste a URLAny public page you want to check.
  2. 2See its canonical tagThe exact rel="canonical" URL the page declares, if any.
  3. 3Check the verdictSelf-referencing, pointing elsewhere, missing, or duplicated.
  4. 4Fix it if neededUpdate the tag in your page's head to resolve any issue found.

Good to Know

  • A missing canonical tag isn't always a problem — but on pages reachable through multiple URLs (tracking parameters, trailing slashes, http vs https), it can lead to duplicate-content issues.
  • A self-referencing canonical (the page pointing at its own URL) is the most common and safest setup — this tool flags it clearly when it sees one.
  • More than one canonical tag on a single page is invalid and can confuse search engines about which one to trust — this tool flags duplicates specifically.
  • A canonical pointing to a completely different domain is sometimes intentional (syndicated content) but often a mistake — worth double-checking when flagged.

Frequently Asked Questions

What does a "self-referencing" canonical mean?

It means the page's rel="canonical" tag points at its own exact URL — the simplest and safest setup, telling search engines this page is the authoritative version of itself.

Is a missing canonical tag always a mistake?

Not necessarily — search engines can infer a canonical on their own — but explicitly setting one removes the guesswork, especially for pages reachable via multiple URL variations.

What if my page has two canonical tags?

That's invalid and this tool will flag it directly — having more than one rel="canonical" tag leaves it ambiguous which URL should actually be treated as canonical.