Free tool
Canonical URL Checker
A canonical tag tells search engines which version of a URL should be indexed. This checker reads the first HTML response.
What this check covers
- Presence of link[rel=canonical]
- Absolute vs relative href
- Host / scheme mismatch vs the final URL
Read it honestly
- Query parameters on the request are not copied into the comparison host.
Questions
Should every page have a self-canonical?
Indexable URLs should. Parameter and UTM variants should canonicalize to the clean URL — which is what SiteRune does for its own pages.
Run the complete SiteRune audit
This tool is one chapter. The full brief walks interiors, scores every chapter, and attaches ship files.