Free Canonical URL Checker

Detect canonical tags, self-referential issues, and duplicate canonical targets.

Check canonical link tags on any page to avoid duplicate content and indexing confusion.

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Instant results for any public URL. We may email follow-up tips; no credit card required for this check.

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About this free canonical url checker

Canonical tags consolidate duplicate URLs so Google indexes one preferred version. Wrong or missing canonicals dilute rankings across copies.

Use this checker to see which canonical URL a page declares and whether it points to itself or another location.

What it checks

  • rel=canonical link tag in HTML
  • Whether canonical is absolute and matches expected URL
  • Signals of missing or cross-domain canonicals

Why it matters for SEO

  • E-commerce filters, tracking parameters, and HTTP/HTTPS duplicates create duplicate content.
  • Canonicals pass consolidation signals without redirects in many cases.
  • International sites pair canonicals with hreflang for clarity.

How to use this tool

  1. Enter a URL that might have duplicates (parameterized, print, or www variants).
  2. Compare the declared canonical to the URL you want indexed.
  3. Fix in template or SEO plugin; verify parameter URLs canonicalize to the clean version.

Common issues we help you catch

  • Canonical pointing to a 404 or redirected URL
  • Every page canonicalizing to the homepage
  • HTTP page canonicalizing to HTTPS inconsistently

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Frequently asked questions

Canonical vs 301 redirect — which wins?
Both can consolidate; redirects are stronger for users. Canonicals are useful when you must keep alternate URLs live.