Canonical URL Checker

Canonical tags help search engines understand which version of a page should be treated as the main one. When they’re missing or misconfigured, duplicate content issues start creeping in, especially on large sites and e-commerce stores.

This Canonical URL Checker lets you quickly verify the canonical tag of any page. You enter a URL, and the tool fetches the canonical reference directly from the page source. No crawling. No guesswork.

What This Tool Checks

The tool focuses on one thing only: the canonical URL declared on a page.

It shows:

• The URL you tested

• The canonical URL found in the page source

• A clear status explaining whether the setup is correct or needs attention

This keeps the check fast and reliable.

Canonical Status Types Explained

Self-Referencing Canonical

The canonical URL matches the page URL. This is the recommended setup for most pages and confirms that the page is correctly declaring itself as the preferred version.

Canonical Pointing to a Different URL

The page declares another URL as canonical within the same domain.
This can be intentional, but it’s also a common cause of ranking and indexing problems if used incorrectly.

Cross-Domain Canonical

The canonical URL points to a different domain.
This is sometimes used for syndicated content, but on e-commerce and business sites it often signals a serious SEO issue.

Missing Canonical Tag

No canonical tag is found in the page source.
This increases the risk of duplicate content, especially when URLs vary by parameters, filters, or pagination.

Why Canonical Tags Matter for SEO

Canonical tags guide search engines when multiple URLs contain similar or identical content. Without them, Google may index the wrong version of a page or split ranking signals across multiple URLs.

Common situations where canonicals are critical:

• Product variants with filters or parameters

• Category and pagination URLs

• HTTP vs HTTPS versions

• Trailing slash and non-trailing slash URLs

• CMS-generated duplicate pages

Who Should Use This Tool

This tool is useful for:

• SEO professionals running technical audits

• E-commerce site owners managing product URLs

• Developers checking canonical logic after deployments

• Content teams reviewing duplicate page risks

If your site generates multiple URLs for the same content, this check is essential.

Limitations to Keep in Mind

This tool checks the canonical tag declared in the page HTML. It does not:

• Crawl internal links

• Verify index status in Google

• Override server-level canonical signals

Use it as a validation tool, not a full audit replacement.