Those Boring Tools
SEO ToolsPrivate by design

Canonical Tag Checker

Paste a page's HTML source to check its canonical tag and og:url — catches missing or duplicate canonical tags before they confuse search engines.

How to use this tool

  1. 1Paste the page's HTML source (view-source or "Inspect" in your browser).
  2. 2See the detected canonical URL and og:url.
  3. 3Fix any missing or duplicate canonical tags flagged.

Frequently asked questions

Why does a canonical tag matter?+

It tells search engines which URL is the "real" version of a page when the same content is reachable at multiple URLs, e.g. with and without tracking parameters.

Does this fetch my live page automatically?+

No — paste the HTML manually. This keeps the tool simple and avoids needing a server to fetch pages on your behalf.

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