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Canonical tag
Canonical tag
Definition
The canonical tag (<link rel="canonical">) tells search engines which URL is the reference version of a page when several URLs display identical or very similar content. It avoids duplicate content issues and concentrates SEO signals on a single URL.
When to use it
- Product pages reachable from several categories
- URLs with parameters (sort, filters, UTM)
- HTTP / HTTPS or www / non-www variants
- Printable, AMP or paginated pages
- Content syndicated on other sites
Best practices
- Place the tag inside the
<head>of every page - Use absolute URLs in HTTPS, without unnecessary parameters
- A page should point to itself (self-canonical) when it is the reference version
- Keep consistency with the XML sitemap and internal linking
- Do not combine canonical and noindex on the same page (conflicting signals)