How do I check the canonical URL of a page?

Enter the page URL into a canonical checker to fetch the HTML and see the declared rel=canonical tag.

What is a canonical URL?

A canonical URL is the preferred version of a page, declared with a rel=canonical tag, that tells search engines which URL to index when duplicate or near-duplicate pages exist.

Why is duplicate content a problem?

Duplicate content splits ranking signals across multiple URLs, wastes crawl budget, and can cause the wrong version of a page to rank — or none at all.

How do I fix a wrong canonical tag?

Update the rel=canonical tag to point to the preferred URL, make sure the canonical URL returns a 200 status, and avoid canonical chains or pointing canonicals at redirects.

SEO TOOLS · FREE ONLINE TOOL

Canonical URL Checker

Verify a page’s canonical tag against its final URLDuplicate content is one of the quietest ranking killers: http versus https, www versus non-www, tracking parameters. The canonical tag is your vote for the master copy, and this checker reads it exactly as a crawler would.

✓ Free to use✓ No sign-up✓ Ready in your browser

// CANONICAL URL CHECKER · GET STARTED

Use Canonical URL Checker

Verify a page’s canonical tag against its final URL

// CANONICAL URL CHECKER · AT A GLANCE

Canonical URL Checker: what to know first.

Verify a page’s canonical tag against its final URL

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Canonicalization problems are one of the most common silent SEO killers. A missing canonical lets search engines guess, a canonical pointing to the wrong URL can de-index a page you want ranking, and duplicate canonical tags send mixed signals that get ignored. The Canonical URL Checker fetches the live page, extracts every canonical tag, follows redirects to the final URL, and gives you a clear verdict.
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It is built for SEOs, site owners and developers who audit pages before and after migrations, verify that CMS or plugin changes did not break canonical output, and troubleshoot duplicate content issues. The comparison ignores trivial trailing-slash differences so you only see real mismatches.

// CANONICAL URL CHECKER · HOW IT WORKS

How to use the Canonical URL Checker

Enter page URL

Enter the full URL of the page you want to check (e.g. https://example.com/blog/post).

Run the check

Click "Check canonical" and wait for the live fetch to complete.

Review the verdict

Review the verdict: match, points elsewhere, missing, or multiple canonical tags.

// CANONICAL URL CHECKER · ABOUT THIS TOOL

About the Canonical URL Checker

Canonicalization problems are one of the most common silent SEO killers. A missing canonical lets search engines guess, and a wrong one can de-index a page you want ranking. This checker fetches the live page, extracts every canonical tag, and gives you a clear verdict.

Built for SEOs, site owners and developers who audit pages around migrations and troubleshoot duplicate content, the comparison ignores trivial trailing-slash differences so you only see real mismatches.

Where it helps most

Audits where canonicals earn their keep.

Template reviews

One misconfigured theme can stamp the wrong canonical on thousands of product pages; sweeping a sample catches the pattern fast.

Post-migration checks

After moving domains, verify canonicals point at the new addresses so old URLs stop lingering in the index for good.

Chain detection

This checker surfaces the tricky canonical chains where page A points to B, which in turn points to C silently.

Mismatch spotting

The tool catches subtle protocol mismatches between the page and its canonical, plus targets that themselves redirect elsewhere unnoticed daily.

Checking well

Read like a crawler.

Follows redirects

The checker follows redirects to the final destination and reads the tag Google actually sees.

Plain-language verdicts

Missing, multiple or mismatched tags are flagged with an explanation of why each matters.

Cross-domain awareness

Cross-domain canonicals are valid for syndication; an accidental one hands your ranking to someone else's page.

Canonical URL Checker: built for trust

Fix the flagged tags, let Google re-crawl, and each page speaks with one URL again.

// CANONICAL URL CHECKER · COMMON QUESTIONS

Canonical URL Checker FAQs

What is a canonical tag?

A canonical tag is a link element in your page head (rel="canonical") that names the preferred URL when similar or duplicate content exists at multiple addresses. It tells Google which version to index and consolidate ranking signals into.

Why does a page need a canonical URL?

What happens if two canonical tags exist on one page?

Can the canonical point to a different domain?

Does the checker follow redirects before reading the tag?

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