Canonical Tag

A canonical tag is a piece of HTML code placed in the head section of a webpage that tells search engines which version of a URL is the definitive, preferred one. It resolves duplicate content issues, which are situations where the same or very similar content is accessible at multiple different URLs.

For care home websites, canonical tag issues arise most commonly when a website is accessible at both www and non-www versions, when pages can be reached with and without a trailing slash, or when a page is accessible via both HTTP and HTTPS. Without a canonical tag pointing to the correct version, Google may index all versions separately and divide the ranking strength that should be concentrated on one URL across several weaker ones.

The canonical tag avoids redirecting users, as they can still access the page at any of its accessible URLs. It is purely a signal to search engine crawlers about which URL should receive credit for the page's content and accumulate ranking signals. When implemented correctly, a canonical tag consolidates all signals from all accessible versions onto the single preferred URL.

A correct canonical implementation means every page has a self-referencing canonical tag pointing to its own definitive URL, and any redirected or legacy URLs point to the current canonical. This is particularly important for sites that have migrated from one domain to another or changed URL structures, which is common in care home websites that have been rebuilt or replatformed.