Free Bulk Canonical Checker
Also called a canonical tag checker, canonical URL checker, or canonicalization checker.
Paste your URLs and instantly see whether each canonical tag is self-referencing, missing, conflicting, or quietly pointing to a broken or wrong page.
Checks self-referencing status, missing or conflicting tags, cross-domain canonicals, and canonical chains.
Why Canonical Tags Matter
A canonical tag (rel="canonical") tells search engines which version of a page is the one to index, when the same content is reachable at more than one URL — with or without a trailing slash, with tracking parameters, through pagination, whatever the case. Get it wrong and you risk duplicate content splitting your ranking signal across multiple URLs instead of one.
Most canonical problems aren’t dramatic — they’re a tag that was never added, one accidentally left pointing at a staging URL, or two conflicting tags after a template change nobody noticed. This checker catches all of that in seconds, across a batch of URLs instead of one at a time.
What This Checker Finds
Self-Referencing Check
Confirms whether a page’s canonical points back to itself, as it should on most pages.
Missing Canonical
Flags pages with no canonical tag at all, in either the HTML or the HTTP header.
Conflicting Tags
Catches multiple canonical tags on one page that disagree with each other — a common template bug.
Canonical Chains
Detects when a canonical target itself points somewhere else again — chains confuse search engines and should point straight to the final URL.
Cross-Domain Canonicals
Flags when a canonical points to a different domain entirely, so you can confirm it’s intentional.
Broken Canonical Targets
Checks whether the canonical URL itself actually loads, or returns a redirect or error.
Reading the Results
How to Use This Tool
Paste Your URLs
One per line, up to 10 — your own site or any public URLs.
Click Check
We fetch each page live and read its canonical tag, plus the HTTP header.
Fix What’s Flagged
Missing, conflicting, or broken canonicals are called out clearly — nothing to dig for.
Frequently Asked Questions
Is this canonical checker free?
Yes — free, no sign-up, no limit on how many times you use it.
What does it mean if my canonical is “self-referencing”?
It means the page’s canonical tag points back to that same page’s own URL — the correct, expected setup for most pages that aren’t duplicates of something else.
Can this check canonical tags in bulk?
Yes. Paste up to 10 URLs at once and each one is checked and reported individually.
Does it check the HTTP header canonical, not just the HTML tag?
Yes. Some sites set canonical via the Link HTTP response header instead of (or alongside) the HTML tag — this checker reads both and flags it if they disagree.
What’s a canonical chain, and why is it a problem?
It’s when page A’s canonical points to page B, but page B’s own canonical points to page C. Search engines may not follow the chain to the true final URL — point canonicals directly at the final destination instead.
Is a cross-domain canonical always wrong?
No — it’s a legitimate technique for syndicated content, but it’s worth double-checking it’s actually intentional, since it’s an easy thing to set by accident.
More Free SEO Tools
Fix Canonical Issues Before They Cost You Rankings
A missing or conflicting tag can split your ranking signal across duplicate pages. Check now — it takes seconds.