Canonical Checker
A reference guide to canonical tag mistakes (self-referencing errors, conflicting canonicals, canonical-to-noindex chains) plus a link to a live checking tool, since fetching a page's actual rel=canonical tag requires a server-side request this browser tool can't make.
- 1Copy the URL of the page you want to check
- 2Paste it above for quick reference
- 3View the page source (Ctrl+U) to find the actual rel="canonical" tag
- 4Compare it against the common-mistakes checklist shown
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