Backlink Audit: How to Run a Link Audit
Most backlink audits start from the wrong question. Someone opens a tool, sorts by a toxicity score, and starts building a removal list. That produces a deliverable quickly and rarely changes anything, because the score was invented by the tool rather than by Google.
A useful link audit asks a different question: where did each of these links come from, and would I be comfortable explaining it? This page covers the full process, what genuinely warrants action, what audit tools and services cost, and the finding most audits are structured to avoid.
The short version
- Group by domain, not by link. One site linking 400 times is one decision, not 400.
- Judge provenance, not scores. How the link came to exist matters more than what a tool labelled it.
- Most sites should not disavow. Google's own guidance says so. Manual actions and known bought links are the exceptions.
- The usual real finding: not too many bad links, too few good ones.
What a backlink audit actually checks
| Signal | What healthy looks like | What warrants a closer look |
|---|---|---|
| Topical relevance | Sites that publish on your subject | Unrelated verticals with no reason to mention you |
| Real organic traffic | Traffic behind the authority score | Good score, negligible traffic |
| Editorial context | Inside an article, in a sentence that makes sense | Footers, sidebars, author bios at scale |
| Anchor text spread | Brand, URLs, natural phrases | The same commercial anchor repeated across many domains |
| Outbound behaviour | The site links out selectively | The site links out to everyone, on every topic |
| Provenance | You know why the link exists | Nobody can explain how it got there |
The last row does most of the work. A link you cannot explain is worth investigating regardless of its score, and a link you can explain is usually fine regardless of how it scores.
How to run a link audit, step by step
- Export referring domains, not backlinks. Start from the domain list. A site with 400 sitewide footer links is one decision to make, not 400.
- Add traffic to every row. Authority scores can look fine while real organic traffic is close to zero. Traffic is the faster filter.
- Classify by relevance. Three buckets: on-topic, adjacent, unrelated. Unrelated is not automatically bad, but it is where patterns hide.
- Check the anchor distribution. Look for the same commercial phrase repeating across unrelated domains. That footprint is the thing worth finding.
- Look for footprints, not offenders. Twenty domains sharing a template, a hosting pattern or a publishing schedule is one story. One odd link is noise.
- Sample the pages by hand. Open twenty of them. Fifteen minutes of reading beats any score for telling you what a site is for.
- Decide per group. Leave, monitor, request removal, or disavow. Write down the reason next to each decision, because the reason is what you will need in six months.
The point of writing the reason down is that audits get repeated by different people. A decision with a recorded rationale survives that. A spreadsheet colour does not.
When a disavow is actually justified
Google's own guidance is that most sites should not use the disavow tool, because links the algorithm does not trust are already discounted. Uploading a file that removes links you were getting no credit from changes nothing, and removing links that were quietly helping is the downside case nobody reports on.
The cases that do justify it:
- A manual action that cites links. This is the clearest one. The disavow file is part of the reconsideration process.
- Links you know were bought. If a previous agency or owner paid for placements, you have provenance rather than a guess.
- A negative SEO pattern you can characterise. A sudden burst of thousands of links sharing one footprint, appearing at once, with no plausible source.
Outside those, a tool label is not evidence. If you do have one of these cases, how to disavow backlinks covers the file format and submission, and the disavow file glossary entry defines the syntax.
Backlink audit tools and what they cost
Any audit needs a backlink index, because you cannot judge a profile you cannot see in full. The main options and their entry pricing are covered on our pricing pages: Ahrefs, Semrush, and Monitor Backlinks. If you only need the index rather than the full suite, our Majestic alternatives roundup covers the cheaper ways to verify link quality.
One practical note: indexes disagree with each other. Running the same audit through two tools will produce two different domain counts, and neither is complete. That is an argument for judging patterns rather than tallying totals.
For the manual checks, our free nofollow link checker tells you how a specific page treats its outbound links.
Backlink audit services: what you are buying
Audit services vary more than their prices suggest, because the deliverable varies. Three questions sort them:
- "What do I receive at the end?" A classified spreadsheet, a disavow file, and a removal outreach plan are three different products.
- "How do you decide a link is harmful?" If the answer is a vendor toxicity score with no provenance work behind it, you are paying for a sort.
- "What will you tell me if the profile is fine?" A service that always finds a cleanup job is selling the cleanup, not the audit.
That last question is the honest one, because an audit that concludes "this is fine, go earn more links" is a real and common correct answer that is hard to invoice for.
The finding most audits are structured to avoid
For a site that has never bought links, the audit almost always concludes the same thing: the profile is not damaged, it is thin. Too few referring domains, too few of them relevant, too few earned in the last year.
That is an uncomfortable result because it converts a one-week cleanup project into months of outreach. It is also the actionable one. Removing links that were already being ignored moves nothing. Adding relevant editorial links moves the thing you actually care about.
If that is where your audit lands, relevant backlinks covers how to qualify targets, how to build backlinks covers the workflow, and white hat link building covers where the line sits so the next audit stays boring.
A tool flags 300 of your backlinks as toxic. What should you do first?
Correct! Toxicity is a vendor score, not a Google signal. Provenance is the real test, and grouping by domain usually collapses hundreds of flagged links into a handful of actual decisions.
Acting on a vendor score alone is the common mistake. Google says most sites should not disavow at all, so start by working out where the links came from.
Your audit finds no bought links, no footprints, and 40 relevant referring domains. What is the finding?
Correct! "Nothing to clean up, go earn more" is a valid and common audit result. It is just harder to sell than a removal project.
An audit that finds no damage has still done its job. It has told you the constraint is acquisition rather than cleanup, which changes what you do next.
If the audit says "earn more links"
MentionAgent runs the outreach that fixes a thin profile: finding blogs publishing on your topic, qualifying them for real traffic and relevance, looking up the right contact, writing a pitch that references their specific post, and following up. You approve every send. Flat $99/mo.
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Frequently asked questions
What is a backlink audit?
A structured review of every site linking to you, grouped by referring domain rather than by individual link, judged on relevance, real traffic and editorial behaviour. The output is a decision per group: leave, monitor, request removal, or disavow. It is not a spam score sorted high to low.
How do I run a link audit?
Export referring domains, deduplicate to one row per domain, then classify each on topical relevance, real organic traffic, whether the link sits in editorial content, and whether the site links out to everyone. Sort by pattern rather than score: the same footprint across dozens of domains matters more than any single bad link.
How often should I audit my backlinks?
Once a year suits most sites, plus one after anything that changes the profile: a migration, a domain purchase, ending an agency relationship, or inheriting a site. Monthly auditing is usually displacement activity, since profiles change slowly and earning new links pays better than re-reading old ones.
Do I need to disavow bad backlinks?
Usually not. Google's guidance is that most sites should not use the disavow tool, because untrusted links are already discounted. It is justified with a manual action citing links, or when you know links were bought by a previous owner or agency. Disavowing because a tool said "toxic" is the common mistake.
What is a toxic backlink?
Toxicity is a score invented by SEO tools, not a signal Google publishes. Useful for sorting, poor as a decision rule. What matters is provenance: whether a link was bought, exchanged, or placed on a site that exists to host links. A link can score badly and be harmless.
What does a backlink audit cost?
Doing it yourself costs a backlink index subscription plus a few hours. Audit services vary widely because the deliverable does: some hand back a spreadsheet, others a disavow file plus a removal outreach plan. Ask which one you are buying before agreeing a price.
What is the difference between a backlink audit and an internal link audit?
A backlink audit reviews links pointing at your site from other domains. An internal link audit reviews how your own pages link to each other. The first is about trust and provenance, the second about crawl paths and how authority moves between your pages.
What does a backlink audit usually find?
For most sites that have never bought links, the honest finding is not too many bad links but too few good ones. That is uncomfortable to deliver because it points at months of outreach rather than a cleanup task, which is part of why audits get framed around toxicity instead.