Bad backlinks
that kill your rankings.

Toxic Backlinks Explained: How to Identify, Remove, and Stay Clear of Bad Links

Every SEO campaign lives or dies by the quality of its backlink profile. Build links the right way, and your rankings climb. Build them the wrong way — or let the wrong links accumulate — and you can undo months of work in a single Google update. The frustrating part is that bad backlinks don't always announce themselves. Some look legitimate at first glance, and some arrive without you ever asking for them.

Understanding what makes a backlink damaging, and knowing how to act when you find one, is just as important as knowing how to build good links. This guide covers both.

What Google Actually Thinks When It Sees a Backlink

To understand why bad backlinks matter, you need to understand the logic behind Google's use of links in its algorithm. At its most basic, Google treats a backlink as a vote of confidence — evidence that another website considers your content worth pointing to. The more of those votes you accumulate from reputable, relevant sources, the more Google trusts your site and the higher it ranks.

The problem arises when those votes are manufactured. Google has invested heavily in identifying links built to game the system rather than to genuinely help users. Any link that Google believes was created as part of a link scheme — rather than earned naturally — is either ignored entirely or treated as a negative signal.

The practical test is simple: if anyone can get a link from a particular site with minimal effort and next to no cost, that link carries little to no SEO value. In many cases, accumulating too many of them creates a liability rather than an asset.

The Five Qualities That Define a Valuable Backlink

Before examining what makes backlinks harmful, it helps to anchor the conversation in what a genuinely good link looks like. These five characteristics separate links that build authority from those that erode it.

When you evaluate any potential link opportunity against these five criteria, the answer to "is this a good link?" becomes much clearer. A link that fails two or more of these tests is almost certainly not worth pursuing.

Three Serious Reasons to Keep Bad Links Out of Your Profile

It can be tempting to dismiss low-quality backlinks as harmless background noise — something Google will simply ignore. That's true in many cases, but the risk calculus changes when those links accumulate in volume or come from the most dangerous source types.

Google penalties are real and they're hard to recover from. A manual action from Google's webspam team can strip a site of its hard-earned rankings almost overnight. Recovering requires not just cleaning up the link profile, but submitting a reconsideration request and waiting — sometimes for months — while Google reviews the site again. The reputational and commercial damage in the meantime can be severe.

Wasted investment compounds over time. Every pound or dollar spent acquiring links that Google ignores is money that could have gone into legitimate link building. The opportunity cost isn't just the money itself — it's the rankings and traffic that legitimate links would have generated. Low-quality link building doesn't just fail to work; it actively crowds out better strategies.

Leaked internal documents have confirmed that PageRank and trust metrics still influence Google's ranking decisions. Links from spammy or irrelevant sources don't exist in isolation — they contribute to how Google perceives your site's overall trustworthiness. A profile cluttered with low-quality links sends the wrong signal even when no individual link triggers a penalty.

Eight Types of Bad Backlinks and How Dangerous Each One Is

The following eight link types cover the most common ways bad backlinks appear in profiles. Each comes with a risk rating to help prioritise what to act on first.

PBN Links — Avoid at All Costs

Private Blog Networks are groups of websites built for the sole purpose of selling links. Google effectively dismantled their usefulness in 2014 with a series of targeted algorithm updates, but sellers still operate in this space — often targeting site owners who don't know what they're buying.

The tell-tale signs of a PBN site include: high volumes of outgoing links to unrelated domains, negligible organic traffic, redirects from other domains, and unusually fast link placement. If you're auditing your existing profile, look for clusters of linking sites with similar template designs, overlapping backlink profiles, and content that exists only to fill space.

Services selling PBN links on platforms like Fiverr — often promising guaranteed DA increases and dozens of links for a few dollars — are the clearest red flag. If the offer sounds too good to be true, it is. Risk rating: must avoid.

Link Farms — Avoid at All Costs

Link farms share the same DNA as PBNs but are typically built on expired domains to borrow whatever authority those domains had accumulated. On the surface, the metrics can look reasonable. Dig deeper and the signs become obvious: thin content with no real audience, stock imagery throughout, no About page or contact information, articles spanning wildly unrelated topics, and anchor text that reads like a keyword list.

Ask yourself a simple question when evaluating any site: would anyone come here if there were no links to sell? If the honest answer is no, you're looking at a link farm. A small number of these links probably won't cause problems — Google's algorithm is generally good at ignoring them. A large number warrants attention. Risk rating: must avoid.

Blog Comment Links — Mostly Harmless

Comment links have been a part of SEO since the earliest days of blogging, and they've been essentially useless for just as long. Most blog comments are tagged nofollow, which tells Google's crawler to disregard them when calculating link authority. Even the rare dofollow comment section is usually already on Google's radar and treated accordingly.

The real danger with comment links isn't damage — it's wasted effort. Automated comment-posting software can deposit links across thousands of blogs at low cost, but generates zero SEO value. If your profile has a large volume of nofollow comment links, the most sensible approach is usually to leave them alone. Risk rating: mostly harmless.

Forum Links — Mostly Harmless

Forum links fall into two very different categories depending on how they came to exist. When someone shares your content on Reddit, IndieHackers, or a niche community forum because they genuinely found it useful, that's a positive signal — not for SEO directly, since these links are almost always nofollow, but for brand exposure, referral traffic, and the kind of organic engagement that tends to attract better links over time.

The problematic version is dropping links across forums without contributing anything meaningful to the conversation. This won't damage your rankings, but it will annoy community members and risk getting your accounts banned. Neither outcome is useful. Risk rating: mostly harmless.

Press Release Links — Mostly Harmless

There's nothing inherently wrong with including a link in a press release. If your announcement gets picked up by a real publication, the journalist covering it may add your link to their story — and that's a legitimate editorial backlink worth having.

The problem arises when press releases are used purely as a link-building vehicle: submitting to free distribution services solely to generate a backlink from the distribution site itself. These sites typically provide nofollow links and carry minimal authority. Use press releases to share genuine news, not to manufacture links. Risk rating: mostly harmless.

Spammy Directory Links — Use Sparingly

Legitimate directories — Yelp, Foursquare, industry-specific listing sites — can provide real value. They help search engines understand your business location and category, and they put your brand in front of people actively looking for services like yours.

The directories worth avoiding are those that exist only to sell listings: sites with no real traffic, no editorial standards, and no connection to your niche. Google's Search Central Guidelines explicitly name low-quality directories as a link scheme to avoid. Listing your site in a handful of well-chosen, reputable directories is fine. Mass-submitting to every directory you can find is not. Risk rating: use sparingly.

Paid Links — Use Sparingly

Buying links is technically against Google's guidelines, but the reality is more nuanced than a blanket prohibition. A well-placed, clearly relevant paid link from a high-authority blogger in your niche — where the link genuinely helps their readers — sits in a different category from bulk-purchased links from low-quality sites.

The danger is reliance. When paid links become the primary mechanism for building a backlink profile, the pattern becomes detectable and the risk of a penalty rises significantly. Use paid placements as one small part of a broader strategy, ensure every paid link delivers genuine value to readers, and prioritise quality over volume. Risk rating: use sparingly.

Link Exchange Schemes — Use Sparingly

Google's guidelines specifically use the word "excessive" when describing link exchanges as problematic — which implies that occasional, relevant reciprocal linking is not inherently against the rules. A genuine partnership between two complementary businesses, each linking to the other because it helps their respective audiences, is a reasonable arrangement.

The version to avoid is systematic link swapping at scale: trading links with dozens of sites regardless of relevance, or joining link exchange networks where the only goal is inflating link counts. Diversity in your link profile matters; over-dependence on any single tactic creates patterns that search engines can identify. Risk rating: use sparingly.

A Quick Reference: Risk Levels at a Glance

How to Remove Toxic Links from Your Profile

Google's own guidance is that you should disavow backlinks if you have "a considerable number of spammy, artificial, or low-quality links" pointing to your site — particularly if you've already received a manual penalty or believe one may be forthcoming.

The process runs through Google Search Console's Disavow Links tool and involves three steps. First, audit your backlink profile using a tool like Ahrefs or Google Search Console to identify the domains you want to disavow. Second, compile those domains into a plain .txt file, with each domain listed on its own line. Third, upload that file to the Disavow Links tool in Google Search Console. Google will then treat those domains as excluded when evaluating your link profile.

One important caveat: disavowing links is a technical action with real consequences, and Google recommends approaching it with caution. Disavowing high-quality links by mistake can hurt your rankings. If you're unsure whether a particular link warrants disavowal, err on the side of leaving it and focusing your energy on building better links instead.

Five Habits That Keep Bad Links Out in the First Place

Prevention is considerably easier than remediation. These five practices will keep most bad links from appearing in your profile to begin with.

• Apply the effort test — if a link from a site is easy for anyone to obtain at low cost, it's almost certainly not worth having
• Vet every third-party service before paying — avoid services that guarantee specific link volumes at suspiciously low prices, or that can't produce real case studies
• Check for PBN and link farm characteristics before accepting any offered link placement
• Ask whether the link serves the reader — if the only purpose is to pass a signal to Google, that's a red flag
• Audit your profile regularly using Ahrefs or a similar tool to catch problems early, before they compound

Have Questions About Your Backlink Profile?

Whether you've spotted something suspicious in your link profile, received a Google penalty, or simply want an expert review of your current backlink situation, get in touch at [email protected]. I work with site owners to audit existing profiles, clean up problematic links, and build the kind of high-quality backlinks that actually move rankings.