Canonical URL Builder

One page answers at five addresses because every campaign glued a utm_source, a gclid or an fbclid onto the end of the URL. Then Search Console tells you the page is a duplicate and that Google picked a different canonical. Paste the full messy address into the field labelled Entrada. You get back the cleaned version plus a ready link rel canonical line to drop into your head.

The cleanup removes a fixed list: utm_source, utm_medium, utm_campaign, utm_term, utm_content, gclid, fbclid, mc_cid, mc_eid, ref and source, along with anything after the hash. Whatever else you had stays, and that is deliberate, because a parameter that changes the content, like id=42 or page=2, belongs in the canonical. Watch ref and source: if your site uses them as real filters rather than trackers, put them back by hand.

A canonical has to be absolute and, on most pages, point at the page itself. Type the address exactly the way your server answers it with a 200, since the tool does not choose between http and https, www or bare, trailing slash or none, and pointing at a URL that redirects weakens the signal. Remember it is a hint: if internal links and your sitemap favour another variant, Google follows the crowd.