Toxic Backlinks: Can Bad Links Hurt Your Site?

At a glance

• “Toxic backlinks” is a label from SEO tools, not a term Google uses. A toxicity score is a tool’s estimate of risk.
• Google’s position is that its systems ignore or devalue most spammy links instead of penalizing the whole site.
• Bad links can hurt in specific cases: links you paid for or built with exact-match commercial anchors, link schemes you took part in, and anything behind a manual action in Search Console.
• Nofollow links don’t hurt your rankings directly. Google treats the attribute as a hint.
• Most “toxic” lists need no action at all. Ask for removal or disavow only when there’s a manual action or a clear pattern you created.

The short answer

What “toxic backlinks” means

Google doesn’t call any link toxic. The term comes from SEO tools that score backlinks for risk. Ahrefs puts it bluntly: “‘Toxic backlinks’ is a term made up by certain SEO tools to scare you” (per Ahrefs, fetched 2026-10-28). The same article quotes Google’s John Mueller saying Google has “no notion” of toxic links.

The best-known score is Semrush’s. Its Backlink Audit gives each link a Toxicity Score on “a scale of 0 to 100, with 0 being good and 100 being very toxic”, groups links into Toxic, Potentially Toxic and Non-Toxic, and uses “45+ different Toxic Markers” to calculate it (per Semrush, fetched 2026-10-28). Semrush defines a toxic link as “any unnatural link that might cause harm to your domain’s ranking in Google.”

Notice the “might”. A toxicity score looks at signals that often go with spam: low-quality domains, odd anchor text, sites with little traffic, links from link networks. It’s a useful way to sort a long list. It’s not a reading of what Google did with any of those links.

Can bad backlinks hurt your site? What Google says

Google’s spam policies define link spam as “creating links to or from a site primarily for the purpose of manipulating search rankings” and list examples such as buying or selling links, automated link creation and low-quality directory links (fetched 2026-10-28).

What Google does with those links is the important part. When Penguin became part of Google’s core algorithm in 2016, Google wrote that “Penguin now devalues spam by adjusting ranking based on spam signals, rather than affecting ranking of the whole site” (Google Search Central blog, September 23, 2016, fetched 2026-10-28). And on disavowing, Google says: “In most cases, Google can assess which links to trust without additional guidance,” so “most sites will not need to use this tool” (fetched 2026-10-28).

Google’s statements are evidence of what Google says, not neutral truth. But our read lines up with them: random spam links mostly get ignored. Where links do hurt, it’s when they form a pattern of manipulation, and Google either devalues the whole lot or a human reviewer issues a manual action.

Penalties for link schemes are uneven. Some sites with obvious paid links rank for years, and some never get a manual action at all. That’s not a reason to build bad links. It’s a reason not to panic about every one you find.

Can nofollow links hurt you?

Not directly. Google treats nofollow, sponsored and ugc as hints “about which links to consider or exclude within Search” (Google Search Central blog, fetched 2026-10-28). A nofollow link from a spam site is about as harmless as a link gets. The exception is a large pattern of paid links you placed and marked nofollow only on some, which is a paid-link problem, not a nofollow one.

The links actually worth worrying about

Most entries on a toxic list don’t need any action. These do:

• Links you paid for. Google’s link spam examples start with “buying or selling links for ranking purposes.” Paid guest posts and link placements from sellers who sell to everyone are the easiest for Google to spot.
• Links with exact-match commercial anchors that you built. Many links all using “best cheap car insurance” as the anchor don’t happen naturally.
• Link schemes you took part in. Excessive link exchanges, “partner pages” built only to swap links, and links required in contracts or terms of service.
• Anything behind a manual action. If Search Console shows a manual action for unnatural links, that’s Google telling you directly. Everything else is a guess.

Links that are usually fine to ignore: random spam domains, scraper sites that copied your content with links intact, foreign-language directories, and links from sites you’ve never heard of. If you saw a sudden flood of these, our upcoming guide to negative SEO explains why it’s usually noise.

How to check for toxic backlinks: a 15-minute triage

You don’t need a full audit to decide whether there’s a problem. Start here:

1. Open Search Console’s Manual actions report. Google’s help page says that if your site has no manual actions, “you’ll see a green check mark and an appropriate message” (fetched 2026-10-28). An “Unnatural links to your site” action means Google “has detected a pattern of unnatural, artificial, deceptive, or manipulative links pointing to your site.”
2. Skim the Links report in Search Console. Look at which sites link most and at the anchor text. Google notes the report shows “a sample of internal and external links” and “isn’t a comprehensive list of every link on your site” (fetched 2026-10-28). It’s enough to spot an obvious pattern.
3. Sort your referring domains in Ahrefs or Majestic. Sort by Domain Rating (or Trust Flow), and look at the bottom of the list. Then check the anchor text report. If one commercial anchor dominates, find out where those links came from.
4. Ask one question about each suspicious group: did we build these? If yes, you might need to act. If no, you probably don’t.

If you want the complete process, a full backlink audit guide is coming. For the tools themselves, see how to check backlinks of a website.

What to do: ignore, remove or disavow

Situation	What to do
Random spam domains you didn’t build, no manual action	Ignore them
A tool marks links “toxic”, no manual action, no pattern you created	Ignore them, or watch for a few weeks
Links you paid for or built with exact-match anchors, no manual action	Ask for removal where you can. Consider a disavow for what you can’t remove
A manual action for unnatural links	Remove what you can, disavow the rest, then file a reconsideration request
A sudden flood of spam links and a ranking drop at the same time	Check for a Google update and technical problems first. Disavow only if a pattern holds up

Disavowing is a blunt tool. If you disavow links that were helping you, you throw away their value, and the toxic list from any tool includes some links that were doing you good. Google’s own guidance reserves disavow for sites with “a considerable number of spammy, artificial, or low-quality links” that have caused or will likely cause a manual action. A separate guide on disavowing links, covering the file format and upload steps, is on the way.

How to remove a backlink

Email the site owner, name the page and the link, and ask them to remove it. Keep it short. Many won’t reply, especially on spam sites, which is why a disavow exists for the links you can’t get removed.

For PBN owners: your network isn’t toxic because a tool says so

If you link from your own private blog network, you’ll often see those links in a “toxic” bucket. That’s expected. Toxicity tools flag signals that private blogs can share: newer content on old domains, few outbound links, low organic traffic. The score says what the tool sees. It doesn’t say Google has found your network.

For a PBN, the questions that matter are different:

• Footprints. Can someone connect your blogs by host, IP, nameserver, Whois, analytics code or theme and plugin combination? That’s what gets a network found. Our guide to PBN footprints separates the real ones from the myths.
• Anchor patterns. Exact-match anchors on every blog pointing at the same page form a pattern, whatever tool you use. Mix brand, URL and descriptive anchors. A guide to anchor text is coming.
• Outbound link patterns. Our PBN guide lists linking only to your own sites as a harmful footprint. Link to other small niche sites too, and don’t link every money site from every blog.

None of this means a PBN is a paid link. You don’t buy links from a network you own. Our guide’s rule is to build your own network and never sell links on it, because public networks that sell links are the ones that get found.

Hosting that leaves no shared trail. On Easy Blog Networks, blogs are hosted on different A-, B- and C-block IP addresses with many different hosting providers, and nameservers come from the provider itself. Each blog installs with a random theme, different plugins and randomized usernames. Plans start at US$39/month for 10 blogs.

FAQ

What are toxic backlinks?

Links that an SEO tool scores as likely to hurt your rankings, usually from spammy or low-quality sites. The label comes from tools, not Google.

Can backlinks hurt your site?

Yes, mainly links you bought or built as part of a scheme, and links behind a manual action. Most spam links that appear on their own are ignored.

Can nofollow links hurt you?

Not directly. Google treats the attribute as a hint about which links to count.

How do I check for toxic backlinks?

Check Search Console’s Manual actions and Links reports, then sort referring domains and anchors in Ahrefs, Semrush or Majestic.

Are Semrush and Ahrefs toxic scores reliable?

Semrush’s Toxicity Score is a useful sorting tool based on its own markers, but it doesn’t reflect what Google did with a link. Ahrefs calls the term a scare tactic invented by tools.

Should I disavow toxic backlinks?

Only if you have a manual action, or a clear pattern of links you built that you can’t get removed. Otherwise, leave them.

How do I remove toxic backlinks?

Ask the site owner to remove the link. If they won’t, and the link matters, disavow it.