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Blog Utility

Canonical URL Checker

Quickly check canonical tag issues in HTML head code, including missing tags, duplicate tags, href format, and absolute URL usage.

Canonical Tag Check Check whether a rel="canonical" tag exists.
URL Format Check Check absolute URLs, http/https format, and empty href values.
Prevent SEO Duplication Clearly tell search engines which URL is the representative page.

Enter HTML Head Code

Paste the page head area or full HTML code to analyze the canonical URL status.

Waiting
0 chars
Enter HTML code and click the Canonical Check button.

Check Result

Check the canonical tag count, href value, URL format, and status.

0 Canonical Tags
0 Valid URLs
0 Needs Check
No. Canonical URL Status
The check result will appear here.

Help

What is a Canonical URL Checker?

The Canonical URL Checker is a free blog SEO utility that finds canonical tags in HTML code and checks whether the representative URL is properly configured. It can be used to tell search engines the preferred URL when duplicate pages, parameter URLs, or similar content exist.

Supported Features

  • Check whether a canonical tag exists
  • Detect duplicate canonical tags
  • Check missing or empty href values
  • Check whether the URL is absolute
  • Check http / https URL format
  • Copy check results

Useful For

  • Checking canonical tags before publishing blog posts
  • Reviewing SEO head tags
  • Preventing duplicate URLs in search engines
  • Checking HTML from Tistory, WordPress, and Django blogs
  • Checking canonical URLs for utility pages
Why is a canonical tag needed?

A canonical tag tells search engines which URL is the representative version of a page. When the same content can be accessed through multiple URLs, it helps search engines understand which URL should be indexed.

Can a canonical URL be a relative path?

Some environments may interpret relative paths, but for SEO management, using an absolute URL starting with https:// is clearer and more reliable.

Is it bad to have multiple canonical tags?

If multiple canonical tags exist, search engines may have difficulty determining the representative URL. In general, it is better to use only one canonical tag per page.

Notice

This tool checks canonical tags based on the HTML code you enter. The result may differ from the final rendered page, so for live pages, it is recommended to also check the browser source or rendered HTML.