Canonical URL
A canonical URL is the version of a page a site declares as the primary one, telling search engines which URL to index when duplicates exist.
A canonical URL is the version of a page that a site declares as the primary one, using a canonical tag in the page head. It tells search engines which URL to index and rank when the same or similar content is reachable at multiple addresses.
How it works
When engines find duplicate or near-duplicate pages (tracking parameters, www and non-www versions, print pages, syndicated copies), the canonical tag consolidates their signals onto one URL. Correct canonicals are self-referencing on primary pages and point to the original on variants. Conflicting canonicals, or canonicals that disagree with redirects and sitemaps, confuse engines and dilute ranking signals.
Why it matters
Duplicate content splits authority across URLs and wastes crawl budget. Clean canonicals concentrate every signal on the page you actually want to rank. Learn more about our GEO agency practice.
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