Canonical Tag Generator

What is a canonical tag?

A canonical tag — <link rel="canonical" href="..." /> in the page's <head> — tells search engines which URL is the authoritative version when the same or near-identical content is reachable at more than one address. Google consolidates ranking signals (links, relevance) onto the canonical URL and generally excludes the duplicates from the index, instead of splitting authority across several weaker pages that compete with each other.

Duplication happens more often than people expect: a URL with and without a trailing slash, tracking parameters like ?utm_source=..., HTTP vs HTTPS, www vs non-www, printer-friendly versions, and paginated or filtered product listings all commonly serve the same content at different URLs.

When to use it

Add a canonical tag to every indexable page, even ones you don't think have duplicates — it's cheap insurance, and self-referencing canonicals (a page pointing to itself) are standard practice. It becomes essential on e-commerce sites where the same product is reachable through multiple category paths or with sort/filter query strings, on syndicated content where the same article runs on multiple domains, and on any page with paginated or parameterized variants.

Example

Say your product page is reachable at both https://northstar-goods.com/shop/jacket and https://northstar-goods.com/shop/jacket?color=navy&ref=email. On the parameterized version, set the Canonical URL field to https://northstar-goods.com/shop/jacket and paste the generated tag into that page's <head> — this tells Google to index and rank the clean URL while still crawling the parameterized one.