Canonical Tag Checker
Check any page's canonical tag status — verify it's present, self-referencing, or pointing to the correct URL. 100% free.
Why Canonical Tag Checker Matters
Duplicate content is one of the most common and quietly damaging technical SEO issues. When Google finds the same content at multiple URLs without a canonical signal, it splits ranking power across variants — diluting your authority and often indexing the wrong version.
Duplicate Content Detection
Instantly see whether a page has a canonical, whether it's self-referencing, and whether there's a URL mismatch to fix.
Crawlability Signal
A correct canonical tag consolidates indexing signals to one preferred URL, concentrating ranking authority where it belongs.
- Pagination, URL parameters, and session IDs all create duplicate content without a canonical.
- HTTP vs HTTPS mismatches are a common source of split canonical signals post-migration.
- Self-referencing canonicals are best practice for all pages — even when no duplicates exist.
How to use Canonical Tag Checker
Enter the Page URL
Paste any page URL you want to check — the tool fetches the live page and reads its HTML head section.
Review the Canonical Status
See whether the canonical is self-referencing, pointing elsewhere, missing, or has a trailing slash mismatch.
Check for Multiple Canonicals
If multiple canonical tags are detected, the tool flags this critical error that can cause Google to ignore all of them.
Fix & Re-verify
After correcting your CMS canonical settings, re-run this tool to confirm the fix is live on the production page.
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Canonical Tag Audit Workflow
Run canonical checks after every site migration, CMS change, or new page template deployment to prevent duplicate content from silently weakening your indexation.
Recommended implementation sequence
SEO Workflow Map
Check Your Key Pages
Start with your homepage, top-traffic pages, and any pages accessible via multiple URL patterns.
Identify Missing or Wrong Canonicals
Flag pages where canonical is absent or pointing to an unexpected URL.
Update CMS Settings
Correct the canonical in your CMS, page builder, or meta plugin — then clear any server-side caches.
Re-verify & Submit
Re-check the page with this tool, then request re-indexation in Google Search Console.
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Frequently Asked Questions
Everything you need to know about canonical tag checker.
A canonical tag (<link rel="canonical" href="..."/>) tells search engines which version of a URL is the preferred one. It prevents duplicate content issues when the same content is accessible via multiple URLs.
Only when the page is a deliberate duplicate or near-duplicate. For example, product pages with tracking parameters should canonicalise to the clean URL. Most pages should self-canonicalise.
No. Multiple canonical tags confuse search engines — Google may ignore all of them. Each page should have exactly one canonical tag in the <head> section.
Without a canonical tag, Google will try to determine the preferred URL itself. This often leads to the wrong version being indexed, splitting ranking signals across multiple URL variants and weakening overall rankings.
Yes — example.com/page and example.com/page/ are treated as different URLs. If both are accessible, one should canonical to the other. This tool detects trailing slash mismatches automatically.
Fonzy adds a self-referencing canonical tag to every generated page, preventing any duplicate content issues and ensuring clean indexation from day one.