What is a canonical tag?

A canonical tag is an HTML element placed inside the of a page that tells search engines which URL is the "master" version. It looks like: . When multiple URLs serve the same content, the canonical tag consolidates ranking signals to the preferred URL.

Should I self-reference canonical tags?

Yes. Best practice is to add a self-referencing canonical tag on every page, even if no duplicate exists. It prevents other systems (CDNs, CMS plugins, scrapers) from accidentally creating duplicate versions without a canonical signal.

Does a canonical tag guarantee the preferred URL is indexed?

No. A canonical tag is a strong hint, not a directive. Google may choose to ignore it if the alternate URL has significantly more links or if the page content differs too much. For a hard redirect, use a 301 instead.

What is the difference between a canonical tag and a 301 redirect?

A 301 redirect sends both users and search engines to the new URL — the old URL stops existing for visitors. A canonical tag keeps the alternate URL accessible to users but tells search engines to treat a different URL as the authoritative one. Use 301 when you fully decommission the old URL; use canonical when you need to keep it live.

Can I use a relative URL in a canonical tag?

Google supports relative canonical URLs, but absolute URLs (including the full protocol and domain) are strongly recommended to avoid ambiguity, especially across CDNs or when content is syndicated.

Does this tool store the URLs I enter?

No. All processing happens in your browser. Nothing is sent to any server.

Canonical Tag Generator

Name: Canonical Tag Generator
Availability: InStock
Author: Nham Vu

Enter a URL and instantly get the correct HTML canonical link tag to prevent duplicate content penalties.

Canonical URL

Enter the preferred (canonical) version of the URL.

URL

Options

Lowercase the URL Strip query parameters Strip URL fragment (#hash) Ensure trailing slash on path

Generated Tag

Your canonical tag will appear here...

Where to place it

Paste the tag inside the <head> section of every duplicate or alternate page:

<head>
  <meta charset="UTF-8">
  <title>Page Title</title>
  <link rel="canonical" href="https://example.com/page/">
</head>

Canonical tag checklist

Use the full absolute URL including protocol (https://)
Add self-referencing canonical tags on all pages, including the canonical itself
Keep only ONE canonical tag per page — multiple tags are ignored
The canonical URL must return a 200 status, not a redirect or 404
Place the tag in <head>, not in <body>

Summary

Enter a URL and instantly get the correct HTML canonical link tag to prevent duplicate content penalties.

How it works

Enter the canonical URL — the preferred version of the page.
The tool validates the URL format and normalizes it.
Your canonical link tag is generated instantly below.
Click "Copy Tag" to copy the HTML snippet to your clipboard.
Paste the tag inside the <head> section of the duplicate or alternate page.

Use cases

Prevent duplicate content penalties when the same page is accessible via multiple URLs.
Consolidate link equity from HTTP and HTTPS versions of the same page.
Specify the preferred URL when pagination, tracking parameters, or session IDs create URL variants.
Signal the correct URL to search engines when syndicated content appears on multiple domains.
Fix canonical tags for print-friendly or AMP versions of pages.
Consolidate www and non-www variants of a domain.
Declare the canonical for product pages accessible via multiple category paths.
Handle trailing-slash URL variants cleanly.

Frequently Asked Questions

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Last updated: 2026-05-29 · Reviewed by Nham Vu