Toxic backlink
A toxic backlink is a link from a site whose only apparent purpose is to manipulate search rankings - link farms, private blog networks, hacked pages, or directories with no editorial standard. The term is an SEO-industry label, not a Google classification.
Also called: spammy backlink, bad backlink, link spam
Last reviewed
It is worth knowing that 'toxicity' scores come from third-party tools applying their own heuristics, and they produce false positives freely. A legitimate but low-traffic niche blog can score as toxic simply for being small and having few links of its own.
The realistic risk is also narrower than the tools' urgency implies. Google's documented position is that its systems ignore the overwhelming majority of low-quality links automatically, because sites cannot control who links to them and penalizing them for it would make negative SEO trivially easy. The links that create genuine exposure are the ones you built or bought on purpose.
That is what makes the distinction actionable. If you are auditing links you did not create, the usual correct response is to leave them alone - and reach for Google's disavow tool only in the specific case of a manual action or a real self-inflicted pattern. If you are auditing links you paid an agency for and they look like this, that is a supplier problem, not a cleanup problem.
Common questions
Should I disavow toxic backlinks?
Usually no. Google says it ignores most low-quality links automatically, and its own guidance is to use the disavow tool sparingly - mainly when you have a manual action or know you built a manipulative link pattern yourself. Disavowing links you did not create is unnecessary work with real downside if you get it wrong.
Can competitors hurt my rankings by pointing bad links at my site?
It is very difficult. Google designed its handling of low-quality links around the fact that site owners cannot control who links to them, so the vast majority of such links are simply ignored rather than counted against you.