Canonical URL

A canonical URL is the version of a page you want search engines to treat as the primary one. You declare it with a <link rel="canonical"> tag in the head or an HTTP Link header, and it consolidates signals from duplicate or near-duplicate URLs.

Why it matters

One page can often be reached through several URLs: with tracking parameters, with and without a trailing slash, or over http and https. Without guidance, search engines choose one themselves and ranking signals may be split.

Canonical tags work best when combined with consistent internal links and sitemap entries that all use the preferred URL, so every signal points the same way.

Example

Both of these URLs show the same product:

https://shop.example/shoes?color=red&utm_source=news
https://shop.example/shoes

Each page includes:

<link rel="canonical" href="https://shop.example/shoes">

Common mistakes

• Pointing the canonical to a redirected or error URL.
• Using a relative or wrong-host URL by accident.
• Treating canonical as a command. It is a strong hint, and search engines can ignore it if signals conflict.

Related

• Duplicate content
• Redirect 301 vs 302
• Indexing
• टूल: Meta tag checker

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