- What are canonical tags and when should you use them?
anonical tags (also called rel=”canonical” tags) are a way to tell search engines which version of a webpage is the “preferred” or “master” version when there are multiple pages with similar or duplicate content.
What does a canonical tag look like?
It’s an HTML tag placed in the <head> section of a webpage:
<link rel=”canonical” href=”https://www.example.com/preferred-page-url/” />
When should you use canonical tags?
Use them when:
- Duplicate content exists across multiple URLs (e.g., www vs non-www, HTTP vs HTTPS, tracking parameters like ?utm=, etc.).
- You have similar content on different pages (like product pages with minor variations).
- You’re syndicating content on other websites and want credit on your original.
- You use pagination (like blog pages 1, 2, 3…), and want to signal the main version.
- You have print versions or mobile versions of pages that mirror main content.
Example use case:
If these two URLs show the same content:
- https://www.site.com/shoes?color=red
- https://www.site.com/shoes
You’d place this tag on both:
<link rel=”canonical” href=”https://www.site.com/shoes” />
This helps avoid SEO issues like content duplication and ensures ranking power isn’t split between versions.
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