Which rel value should you use?
| Link type | Use | Example |
|---|---|---|
| Editorial link you vouch for | No rel (followed) | Citing a source, recommending a tool |
| Paid, sponsored or affiliate | rel="sponsored" | Affiliate links, sponsored reviews, ads |
| User-generated | rel="ugc" | Comments, forum posts, community answers |
| Anything you don't endorse | rel="nofollow" | A source you're criticizing |
| Opens in a new tab | target="_blank" rel="noopener" | External references in docs |
Google asks that links given in exchange for money or other value use sponsored (or nofollow). Since 2020 it treats nofollow, sponsored and ugc as hints rather than strict rules. For the full background, read our guide to dofollow vs nofollow links.
Check links that already exist
To see how a link on someone else's page is set up, use the backlink checker: it reads the live page and reports the rel value, anchor text and placement for every link to your site.