Backlink Audit: Tools, Metrics, and My No-Bullshit Process

Focus your backlink audit on metrics that actually correlate with ranking performance. The most important one is referring domains—not total backlinks. A hundred links from the same domain count as one vote; ten domains each linking once are ten distinct votes. I also track link velocity (how fast new links appear), anchor text distribution (over-optimised anchors are a red flag), and contextual relevance (a link from a page about your topic carries more weight than a random directory listing).

Tools like Ahrefs, Semrush, and Moz measure these differently. Ahrefs’ Domain Rating (DR) and Semrush’s Authority Score are moderately correlated with Google rankings, but treat them as directional signals, not absolute truths. If you want a deeper dive into building a healthy profile, check out my guide on high-quality backlinks.

Here’s the process I use for every backlink audit, whether it’s a new client or my own site:

1. Export links from GSC – Go to Google Search Console > Links > Top linked pages. Download the data. It’s free, so no excuses.
2. Add a second tool – I usually run Ahrefs or Semrush to catch links GSC misses. The two datasets together cover roughly 80-90% of real links. Still not perfect, but better than one.
3. Filter for spam signals – Look for PBNs, paid links, irrelevant sites, and over-optimised anchor text. Tools will flag these, but I manually review each one. Don’t trust the machine blindly.
4. Compare against top competitors – Use competitor backlinks analysis to find domains they have that you don’t. This is where the real value hides.
5. Prioritise disavow actions only for clear spam – See the next section. Most flags are false positives.
6. Document changes – Save the audit data so you can measure progress next quarter. If you don’t track it, you didn’t do it.

For a full walkthrough of my entire workflow, see Methods I use.

Google’s disavow tool is a last resort, not a routine maintenance step. Google is very good at ignoring spammy links, and most sites never need to submit a disavow file. I only disavow when I have clear evidence of a link scheme: paid links, PBNs, or obviously manipulative anchor text from a site I cannot contact for removal.

Automated toxicity scores are useful as a starting point, but they are not Google’s verdict. Over-disavowing can harm your profile by removing links that were actually helping. Always manually review flagged links before taking action. For more on the risks, read Risk & hats.

The most valuable output of a backlink audit is often not the list of toxic links but the list of opportunities. I compare my referring domains against those of my top 3-5 competitors. Tools like Ahrefs and Semrush have built-in gap analysis features that show which domains link to competitors but not to you.

Once I have that list, I prioritise by relevance and authority. A link from a relevant, high-traffic page is usually more valuable than ten links from random directories. I then use that data to plan my link building campaign. See also link prospecting for how I find contact details.

Here’s how the major tools stack up for enterprise-level auditing. I use this table to decide which tool fits a given project:

Ahrefs gives me the most comprehensive data for technical audits, while Semrush wins on workflow features for disavow prep. For a broader look at what I use, see Tools I rely on.

Real-world pricing varies by plan and billing cycle. Semrush currently runs from about $117 to $129.95/month, Ahrefs from $119 to $129/month, Moz from $49 to $99/month. Free options like Google Search Console and Ahrefs Webmaster Tools are sufficient for many smaller sites.

I recommend a full backlink audit every quarter for most sites. High-risk niches (gambling, pharma, finance) or sites that have received a manual action may need monthly checks. In between, I use backlink monitoring to watch for new or lost links, unusual velocity spikes, or sudden changes in anchor text distribution.

Track these metrics over time:

• Referring domains – total and growth rate
• Lost links – which ones and why
• New links – quality and relevance
• Anchor text ratios – watch for over-optimisation
• Competitor gaps – how many opportunities you’ve closed

Documenting each audit in a link building report helps you spot trends and justify budget or tool changes.