Canonical URL Checker
Validate canonical tags — protocol, www, trailing slash, and page consistency. Catch the canonical pointing at staging — local checks, free, no signup.
How to Use the Canonical URL Checker
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Frequently Asked Questions
What breaks canonicals most?
Pointing at staging/dev domains, http/https mismatches, and trailing-slash inconsistencies. One wrong canonical can deindex entire sections.
Self-referencing canonicals?
Yes, every indexable page should self-canonicalize — it consolidates www/non-www and parameter variants to the chosen URL.
Trailing slash policy?
Pick one sitewide (Toolzum uses trailing slashes) and canonicalize to it. Mixed slashes split ranking signals.
Is URL data uploaded?
No — checks run locally in your browser. Nothing leaves your device.
What are the fetch timeouts and caps?
Direct browser fetch aborts after 15 seconds; the server fallback gets 20 seconds at ~20 fetches/min. Pages over the 1.5 MB cap (or pages that block bots) fall back to structural-only analysis — check the canonical tag manually in that case.
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Last updated October 2026