TOOLS.GAMESLOOP234 Free Online Tools

Canonical URL Checker

Validate canonical tags and spot the mistakes that break them.

Input

Supply it to check that the canonical self-references correctly.

The canonical correctly self-references the clean version of this page.

Why paste HTML instead of a URL?

A tool that fetches arbitrary URLs from our server is a server-side request forgery risk and can be abused to probe private networks. Pasting the HTML gives identical results and works on staging sites and pages behind a login.

What does Canonical URL Checker do?

Check canonical URLs for the problems that quietly cost indexing: relative paths, mismatched protocols, trailing-slash inconsistency, tracking parameters and canonical chains. Paste a URL or a page’s HTML.

How to Use Canonical URL Checker

  1. 1
    Paste a canonical URLOr the full HTML of the page.
  2. 2
    Add the page URLSo self-reference can be checked.
  3. 3
    Review the findingsEach issue explains its consequence.

Key Features

  • Validate a canonical URL directly, or extract it from pasted HTML
  • Flags relative URLs, which must be absolute
  • Detects protocol and subdomain mismatches
  • Warns about tracking parameters and session IDs in a canonical
  • Checks trailing-slash consistency against the page URL
  • Detects canonical chains, where the target canonicalises elsewhere

Frequently Asked Questions

Why must a canonical URL be absolute?

Because relative canonicals are resolved against the current page, and any base-URL confusion sends them to the wrong place. Google explicitly recommends absolute URLs including the protocol and host.

Should a page canonicalise to itself?

Yes. A self-referencing canonical on every page is standard practice. It removes ambiguity when a page is reachable with tracking parameters, and it is cheap insurance.

Does the trailing slash matter?

To a search engine, /page and /page/ are different URLs. Pick one convention, redirect the other, and make sure canonicals, internal links and your sitemap all agree.

What is a canonical chain?

Page A canonicalises to B, and B canonicalises to C. Search engines may not follow the whole chain, so signals get lost. Every page should point directly at the final canonical.

Runs in your browser

Analysis runs on the text or HTML you paste, inside your browser. Nothing is fetched from your site and nothing is uploaded, so the tools work on staging environments and pages behind a login.

How the rest of the site handles data

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