Canonical Tag

Definition

A canonical tag is a snippet of code in a page's HTML that names the preferred, master version of that page. It tells search engines to consolidate ranking signals onto one URL when several URLs show the same or very similar content.

In depth

Sites often serve the same content at more than one address: with and without a trailing slash, with tracking parameters, or as both a print and a web version. A canonical tag points all of those at the one URL you want to rank, so search engines treat them as a single page instead of competing copies. It's a core piece of technical SEO that keeps your URLs tidy before anyone tries to rank them.

For a contractor's site, this keeps your ranking strength from getting diluted. If your kitchen remodeling page can be reached three different ways, you want all the credit and any backlinks flowing to one address rather than spread thin across near-duplicates that each rank weaker. Cleaner signals mean a better shot at the page you actually care about showing up in the SERP.

The common mistake is setting canonicals that point to the wrong page, or letting a template canonicalize every page back to the homepage, which quietly tells search engines to ignore your service pages entirely. We audit canonical tags whenever we build or take over a site, watch indexing in Google Search Console, make sure each important page points to itself, and only consolidate where pages truly are duplicates.

Worked example

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