Checking backlinks answers two different questions. The first is defensive: what already links to my site, and is any of it doing harm? The second is strategic: what links do the sites outranking me have that I do not? A good audit covers both, because the gaps you find in the second are exactly the campaign you should run next.
Tools do the gathering; your judgement does the deciding. No crawler can tell you whether a link is genuinely relevant or merely metrically impressive, so treat the data as a starting point and review the linking pages yourself. The tools also disagree with each other and with Google, because each runs its own crawler on its own schedule, which is exactly why cross-referencing matters.
What to look at in your own profile
- Referring domains. How many distinct sites link to you, and are they names you would be happy to be associated with? Distinct domains matter far more than raw link count.
- Linking pages and context. Is each link inside real content, or buried in footers, sidebars and link lists?
- Anchor text spread. A natural profile is mostly branded and descriptive. A wall of exact-match commercial anchors is a red flag you created yourself, and a known signal of negative SEO when it appears suddenly.
- Relevance. Are the linking sites in or near your field, or a random scatter of unrelated topics and languages?
- Followed versus nofollowed. A healthy profile carries a natural mix. An all-followed profile of commercial anchors looks engineered.
- Link health. Are your most valuable links still live, still indexed, and still pointing at the right page?
- Spam patterns. Sudden spikes of low-quality links, often from a negative SEO attack or a past cheap campaign, that deserve a closer look.
The tools, and what each is good for
The leaders cluster for a reason. In the Editorial.link 2025 survey of 518 SEO professionals, Ahrefs was the clear favourite, with 68.1% rating it the most accurate source for backlink data and 59.1% naming it their primary SEO tool. That does not make the others redundant: each has a different index and a different strength.
| Tool | Best for | Watch out for |
|---|---|---|
| Ahrefs | Large, fast-updating index; deep competitor analysis and link intersect | Paid; can over-report lost links |
| Semrush | Broad toolkit; backlink audit with a toxicity score and GSC connection | Automated toxicity scores need human review |
| Majestic | Trust and citation flow metrics; long-running historic index | Different metrics from the others, takes learning |
| Google Search Console | The links Google itself has found, free, straight from the source | No competitor data; a sampled, partial view |
A spam or toxicity score from any of these is a prompt to investigate, not a final judgment. Open the linking page and judge it as a person would: real site, relevant topic, genuine content, sensible anchor. That five-second human check beats any automated label, and it is the step most rushed audits skip.
Competitor gap analysis
Run two or three competitors who outrank you through the same tool and compare. You are looking for the publishers, resource pages and story types that link to them and not to you. Most tools call this a link intersect or backlink gap report. That list is the most useful output of the whole exercise: it tells you which doors are already open in your space, so your next campaign aims at targets you know will entertain a relevant pitch. Our full method is in competitor backlink analysis.
Common mistakes
The usual errors: trusting a toxicity score without looking at the page; rushing to disavow links that are harmless, which can quietly remove value you earned; obsessing over a slightly higher referring-domain count than a rival rather than the quality behind it; comparing raw totals between tools that were never going to match; and auditing so often that normal fluctuation looks like a crisis. An audit should end in a short list of actions, not a spreadsheet you never open again.
How SEO Backlinks approaches this
For our own clients, the audit feeds the strategy rather than sitting in a report. We use the competitor gap to decide which publications and angles to pursue, then earn digital PR backlinks against the pages that need support, and every placement we land is tracked in a dashboard so the profile stays auditable. If you want help reading your own data, our guides to competitor backlink analysis and toxic backlinks go deeper on each side of the job.
Keep reading
- What makes a good backlink?, the criteria your audit should apply
- How to build backlinks, turning gaps into a campaign
- Toxic backlinks, spotting and handling the harmful ones
- Backlink quality checklist, a quick screen for any link
- Book a call for a review against your competitors
FAQs
What is the best tool to check backlinks?
Ahrefs, Semrush and Majestic have the largest link indexes and are the usual first choice. Google Search Console is free and shows the links Google itself has found, which is the set that ultimately matters. Most serious audits cross-reference at least two sources, because no single index sees every link.
Can I check my backlinks for free?
Yes, up to a point. Google Search Console lists your links at no cost, and the free tiers of the major tools give a partial view. For a full profile and a like-for-like competitor comparison you usually need a paid plan or a one-off audit.
How do I know if a backlink is toxic?
Look for irrelevant or foreign-language sites, pages built only to host links, exact-match anchors at scale, and sudden spikes of low-quality links. One odd link rarely matters; a pattern of them is the warning sign. A tool's toxicity score is a prompt to investigate, not a verdict, so judge the linking page yourself.
Why do backlink numbers differ between tools and Search Console?
Each tool crawls the web with its own bots and updates on its own schedule, so no two indexes match exactly, and none matches Google's internal view. That is why an audit should compare the page-level reality, not just argue over which total is highest.
How often should I check my backlinks?
A full audit once or twice a year suits most sites, with a lighter monthly glance if you are running active campaigns or have had spam issues. Checking too often produces noise rather than action.