What is a canonical URL tag?

A canonical URL tag (rel="canonical") is an HTML element that tells search engines which version of a page is the preferred, original version. It prevents duplicate content issues when multiple URLs serve the same content.

How do I check if my page has a canonical tag?

Enter the page URL in the QuickToolify Canonical URL Checker and click Analyze. The tool will fetch the page and show you whether a canonical tag exists and what URL it points to.

What happens if a page has no canonical tag?

Without a canonical tag, Google may select any version of a duplicate URL as canonical, which could dilute your SEO authority. It is best practice to explicitly set canonical tags on all pages.

Can a canonical tag point to a different domain?

Yes. Cross-domain canonicals tell Google that the original version of the content lives on another domain. This is used when syndicating content or migrating sites.

What is a self-referencing canonical?

A self-referencing canonical means the canonical tag on a page points to that same page itself. This is recommended best practice for all unique pages, even without duplicates.

How do I fix a wrong canonical tag?

Find the canonical tag in your page's section and update the href attribute to the correct URL. In WordPress, use a plugin like Yoast SEO or Rank Math to manage canonicals.

Does canonical affect PageRank?

Yes. Canonical tags consolidate link equity (PageRank). Backlinks pointing to non-canonical URLs pass their value to the canonical page, concentrating authority where it matters.

Should I use canonical or 301 redirect for duplicate content?

Use a 301 redirect when you permanently want to redirect users. Use a canonical tag when the page should still be accessible at the original URL but you want search engines to prefer the canonical version.

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How to Check Canonical URL in 3 Steps

Verify canonical tags on any page in seconds

Enter Page URL

Paste the full URL of the page you want to check the canonical tag for.

Click Analyze

The tool fetches the page and extracts the canonical tag from the HTML head section.

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See whether a canonical tag exists, what URL it points to, and any recommendations.

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Frequently Asked Questions — Canonical URL Checker

Everything about canonical tags and duplicate content

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Canonical URL Checker