Cleaning up Backlinks: An SEO Guide to Toxic Backlinks
If you run a website for long enough, you will eventually find some strange websites linking to it.
The natural reaction is usually: “Are these links hurting my SEO?”
Sometimes they can be a problem. But very often, they are simply part of being on the internet and Google already knows how to ignore them.
This is where the idea of toxic backlinks gets confusing. An SEO tool might give a link a high Toxicity Score or label a referring domain as dangerous, but that does not automatically mean the link is damaging your rankings. What matters more is whether your wider link profile shows signs of deliberate manipulation.
Key Takeaways
- Not every suspicious-looking backlink is harmful, and most random spam links can simply be ignored.
- The bigger risk comes from deliberate link schemes, paid links, private blog networks and manipulative Anchor Text used at scale.
- A backlink audit should focus on patterns across the wider link profile rather than judging individual links in isolation.
- Google’s Disavow Tool is not something most websites need to use routinely and should be handled with care.
- The Penguin Algorithm changed how Google treats manipulative links, but today link quality, relevance and natural acquisition matter far more than sheer quantity.
What Are Toxic Backlinks?
Toxic backlinks are generally links that appear spammy, artificial or created mainly to manipulate search rankings. Google itself tends to talk about link spam, unnatural links and link schemes rather than using “toxic backlink” as an official classification.
Most websites do not need to remove every poor-quality backlink they find. Search engines are generally good at ignoring a lot of random web spam. Cleanup becomes much more important when a business, an old SEO provider or another party has deliberately created a large number of manipulative links.
The SEO industry uses the term toxic backlinks for incoming links that may create risk for a website.
I prefer to look at why the link exists.
A strange-looking backlink is not necessarily harmful. What concerns me more is whether it appears to have been created primarily to influence a search engine rather than help a real user.
Examples can include:
- paid links that pass ranking value
- private blog networks
- link farms
- automated forum or directory links
- keyword-heavy links placed across unrelated sites
- large reciprocal link schemes
- links inserted into hacked websites
- site-wide links created mainly for SEO
A single spammy backlink is rarely something I would panic about. A backlink profile containing thousands of links from the same type of link scheme is a different matter.
Do Bad Backlinks Still Hurt SEO?
They can, but Google has become much better at recognising links it does not trust.
This means a website owner usually does not need to react every time a questionable referring domain appears in Google Search Console.
The bigger concern is a pattern that suggests deliberate link building.
Imagine a plumbing business suddenly has thousands of links using exactly the same Anchor Text: “best plumber Gold Coast”. Most come from unrelated websites, link farms and old article directories.
That looks very different from a natural link profile containing the company name, URLs, supplier mentions, local organisations, news articles and genuine business directories.
This is why I look at backlink profiles as a whole rather than judging every link individually.
What Was the Google Penguin Algorithm?
The Penguin Algorithm is an important part of this story because it changed the way SEO approached backlinks.
Google launched Penguin in 2012 to tackle manipulative link building.
Before Penguin, building links in large numbers could work surprisingly well. SEO companies created forum profiles, article directory links, blog comments and exact-match Anchor Text at scale because those tactics could push pages higher in the search results.
Quality was often secondary. Quantity was the goal.
The Penguin Algorithm changed that. Sites relying heavily on artificial links could lose significant visibility, and many businesses suddenly found themselves trying to undo years of questionable SEO work.
Google later incorporated Penguin into its core ranking systems in 2016, so today we are not waiting for a standalone Penguin update before links are reassessed.
The history still matters. Older websites can carry link profiles created more than a decade ago, often by SEO providers the current business owner never even worked with.
It is one reason being careful when choosing an SEO agency matters. Bad link building can outlive the company that created it.
How Can You Tell If a Backlink Is Actually Bad?
There is no single metric that gives you a perfect answer.
Domain Authority, Toxicity Score, Domain Rating and a Toxic Backlink Checker can help sort through a large dataset, but I would never automatically remove a backlink simply because a tool colours it red.
Look at the website itself
Does the site appear to exist for real visitors? Is there genuine content, a real business or an identifiable audience?
Or is every article conveniently linking to unrelated companies?
Check relevance
A backlink does not have to come from exactly the same industry, but there should usually be a logical reason for it to exist.
A travel site linking to a local restaurant makes sense. Hundreds of casino and cryptocurrency sites linking to that restaurant do not.
Look at the Anchor Text
Natural Anchor Text normally varies. You would expect brand names, URLs, product names and descriptive phrases.
If one commercial keyword dominates the link profile, particularly across low-quality sites, I would investigate further.
Look for patterns
One questionable link means very little. Fifty referring domains with the same layout, content style and outbound links might tell a different story.
Links That Look Bad but Usually Do Not Need Action
This is where a lot of unnecessary cleanup happens.
| Link Type | Should You Worry? |
|---|---|
| Scraper sites | Usually not. Search engines see these constantly and are generally good at ignoring them. |
| Low Domain Authority sites | Not automatically. A small genuine website can still provide a legitimate link. |
| Foreign-language sites | Context matters. International links are completely normal for many businesses. |
| Legitimate directories | Usually fine where the directory exists for real users. |
| Private blog networks | Potentially high risk, especially when used deliberately at scale. |
| Link Farms | Worth investigating where the site appears to exist mainly for building links. |
A legitimate local directory, for example, can still support local SEO. Context matters far more than how attractive the website looks.
How to Find Backlinks Pointing to Your Site
Google Search Console is a good place to start.
The Links report shows top linking websites, pages receiving external links and common Anchor Text. It does not necessarily show every backlink Google knows about, so I treat it as a useful sample rather than a complete database.
Tools such as Ahrefs, Semrush and Majestic can expand the picture and help identify suspicious referring domains.
For a serious backlink audit, I normally combine more than one data source.
How to Run a Backlink Audit
1. Check for manual actions
Start in Google Search Console and check the Manual Actions report.
If Google has issued a manual penalty for unnatural links, you have a clear reason to investigate the backlink profile carefully.
A manual action and an algorithmic drop are not the same thing. Manual actions involve a manual review by Google and normally appear inside Search Console.
2. Export the links
Combine Google Search Console data with a third-party backlink database if possible.
3. Analyse the link profile
Look for patterns rather than individual ugly URLs:
- large numbers of exact-match anchors
- groups of suspicious referring domains
- links appearing suddenly over a short period
- private blog networks
- link farms
- bulk directory submissions
- links connected to an old campaign
4. Manually review suspicious groups
This part still matters. Automated scores can tell you where to look, but they cannot always understand why a link exists.
5. Separate links into three groups
- legitimate links to keep
- random spam that can probably be ignored
- deliberately manipulative links that may need action
A good backlink audit is as much about protecting useful links as removing bad ones.
Should You Remove Bad Backlinks Manually?
If you or a previous provider deliberately created a problematic backlink and it can reasonably be removed, contacting the website owner is still the cleanest option.
Keep the request simple. Tell them which page contains the link and which URL it points to.
I would not spend weeks chasing anonymous websites or paying ridiculous removal fees.
If removal is impossible and there is a genuine reason to address the link, you may need to disavow links instead.
When Should You Use Google’s Disavow Tool?
This is where I would be very cautious.
The Disavow Tool should not be part of routine SEO maintenance. Google itself says most websites do not need it.
I would normally consider it when there is a significant number of artificial links and either:
- the site has received a manual action, or
- there is a strong reason to believe a manual penalty could occur because of deliberate link schemes.
That is very different from uploading a Disavow file because a third-party tool found a few suspicious domains.
The danger is that an overly aggressive Disavow file can remove legitimate ranking signals and reduce Domain Trust rather than improve it.
How Does a Disavow File Work?
A Disavow file is a simple text file telling Google which backlinks you do not want considered.
You can list individual URLs or an entire referring domain:
domain:example-spam-site.com domain:another-link-network.com
Domain-level entries are often more practical where the entire site is part of the same link scheme.
Uploading a new file replaces the existing one for that property, so always check what is already there before submitting another version.
Disavowing does not remove the backlink from the web. It asks Google’s search engine systems not to take that link into account.
How Long Does a Disavow Take to Work?
Not immediately.
Google needs to recrawl the linking pages and process the changes. That can take several weeks.
I would also avoid assuming every decline in organic traffic is caused by links. Technical problems, algorithm updates, content quality, competitors and changing search behaviour can all affect rankings.
What About Negative SEO?
Negative SEO is the idea that a competitor deliberately creates spammy links to damage another website.
A negative SEO attack might involve thousands of automated links, suspicious Anchor Text or links from clearly manipulative networks.
In theory, this is possible. In practice, Google has spent years developing systems designed to recognise and ignore this type of link spam.
This means a sudden pile of scraper links does not automatically mean you are under a negative SEO attack.
If you suspect a serious negative SEO attack, look at the pattern, timing and source of the links before taking action. A large unexplained spike from coordinated referring domains deserves investigation. Ordinary internet junk usually does not.
What Do Good Backlinks Look Like?
The best links usually exist because there is a genuine reason for one website to send someone to another.
Examples include:
- a journalist referencing your research
- an industry organisation listing your business
- a supplier linking to an authorised retailer
- a useful guide being referenced in another article
- a local publication mentioning your business
- a genuine product review
Good link building is really about earning relevance and trust rather than hitting an arbitrary backlink number.
Building links should support the wider SEO strategy, not become a separate exercise where quantity is the only goal.
How to Avoid Backlink Problems in the Future
I would be cautious of anyone promising hundreds of backlinks every month, guaranteed “high authority” placements, cheap bulk guest posts or exact-match Anchor Text campaigns.
Ask where the links are coming from and why a real website would want to publish them.
If the answer is basically “because we paid them so Google will rank you”, there is a good chance the strategy will eventually create more problems than it solves.
Final Thoughts
The biggest change since this article was first written is that backlink cleanup should no longer mean hunting down every suspicious-looking link and automatically disavowing it.
Google’s search engine systems are much better at ignoring ordinary link spam than they were when Penguin first launched.
But the lesson from Penguin still matters: manipulating links at scale is not a sustainable strategy.
If your site has a history of paid links, link schemes or questionable SEO work, a proper backlink audit can still be worthwhile. The goal is simply to identify genuine risk rather than treating every ugly backlink as toxic.
If you are concerned that previous link building may be affecting your site’s performance, get in touch with eCBD. We can review the backlink profile alongside the wider SEO picture rather than relying on a Toxicity Score alone.
Frequently Asked Questions
What are toxic backlinks?
They are backlinks considered potentially harmful because they appear artificial, spammy or created to manipulate rankings. Google generally refers to these practices as link spam or unnatural links.
How do I know if a backlink is toxic?
Look at context rather than one tool score. Link schemes, manipulative Anchor Text, paid followed links and coordinated low-quality referring domains are much more concerning than a random spammy backlink.
Should I disavow spammy backlinks?
Usually not simply because they look bad. The Disavow Tool is intended for more serious situations involving significant artificial linking and an existing or likely manual action.
Can negative SEO hurt my website?
A negative SEO attack is possible in theory, but search engines are designed to recognise and ignore a lot of externally created spam. Investigate unusual patterns before assuming random bad links are damaging your site.
Can backlinks cause Google penalties?
Deliberate link schemes can lead to manual actions or loss of ranking value. The risk is much greater when manipulative links were intentionally built than when unrelated spam sites link to you without your involvement.
Is Google Penguin still used?
Penguin is no longer a separate update. The Penguin Algorithm was introduced in 2012 and became part of Google’s core ranking systems in 2016, but its impact on how SEO approaches manipulative links is still very relevant.
