Browser-first · No sign-up

Canonical URL Checker – Check the Canonical Tag on Any Page

Inspect rel=canonical tags, compare the canonical target with the page URL, and get clear guidance for audits or publishing.

No uploads. Everything runs locally in your browser.

Check canonical tags quickly

Fetch a page or paste its HTML to see the rel="canonical" value, compare it to the checked URL, and get a quick interpretation.

Note: Some sites block browser fetches. If that happens, switch to HTML mode and paste the source.

Fetch the page directly. Some sites may block browser fetches.

Canonical tags are hints, not guarantees. If a site blocks browser fetches, switch to HTML mode and paste the source.

Ready to check.
Result summary
Waiting

Enter a URL or paste HTML, then click Check Canonical to see the detected rel="canonical" value and guidance.

What is this tool

This Canonical URL Checker detects rel="canonical" tags on a page or in pasted HTML. It compares the canonical target with the URL you expect to rank and highlights missing, mismatched, or invalid canonicals.

How to use

  1. Select Check URL to fetch a live page or Paste HTML to inspect raw source.
  2. Enter the page URL or paste the HTML source code.
  3. Click Check Canonical to extract and compare the rel="canonical" value.
  4. Review the status, interpretation, and any issues called out.
  5. Copy results, clear, or load the example as needed.

Features

  • URL fetch mode with graceful CORS/blocked-site fallback messaging.
  • HTML paste mode to inspect pages that block cross-origin fetches.
  • Canonical detection with match/mismatch/missing/invalid states.
  • Relative canonical resolution against the checked URL when available.
  • Copyable results with status and extracted canonical tag snippet.
  • Example loader and reset controls for quick testing.

Use cases

  • Check blog posts to confirm they self-canonicalize before publishing.
  • Audit landing pages or campaign variants that point to a primary URL.
  • Review pagination or filtered URLs to ensure canonicals consolidate signals.
  • Validate canonical tags during technical SEO audits or migrations.
  • Inspect templates to catch missing or invalid canonical href values.

Popular ways to use this tool

  • Check whether a page points to itself canonically.
  • Review canonical tags on blog posts before publishing.
  • Inspect duplicate or similar landing pages.
  • Compare filtered URLs with their preferred canonical page.
  • Validate canonical tags during technical SEO audits.

FAQ

What is a canonical URL?

A canonical URL is the preferred version of a page that search engines should treat as primary when duplicates or variants exist.

What does a canonical tag do?

The rel="canonical" tag signals which URL you want indexed and consolidated for ranking signals.

Can I paste HTML instead of fetching a live page?

Yes. Switch to HTML mode, paste the source, and check without fetching the live URL.

Does a canonical tag guarantee Google will use it?

No. Canonical tags are strong hints, but search engines can choose a different URL if signals disagree.

What if a page has no canonical tag?

Search engines may pick their own canonical. Adding a clear rel="canonical" helps reduce ambiguity.

Canonical URL Checker — key benefits

  • Completely free with no signup or registration required.
  • Runs entirely in your browser — your data is never uploaded.
  • Works on desktop, tablet, and mobile devices.
  • Instant results with no waiting or processing queues.
  • Part of the ToolCircuit suite of free online seo tools tools.

Related tools