Use a free canonical tag generator that builds the rel=canonical link tag from your preferred URL in the browser. Paste the tag into your page head to point search engines at the main version and avoid duplicate content issues. It needs no account and nothing is uploaded.
When the same content is reachable at more than one URL, search engines can get confused about which one to index. A canonical tag names the preferred URL so ranking signals consolidate on a single version. A generator produces the correct link tag with your chosen URL so it is formatted exactly right.
The tool creates the canonical link tag locally from the URL you enter, so nothing is uploaded. You paste your preferred URL, copy the tag, and add it to the head of the relevant page, repeating it for as many pages as you like with no sign-up.
It produces a rel=canonical link tag pointing at the preferred URL you enter.
No. The tag is generated in your browser, so nothing is uploaded.
No. It is free with no account required.