Free Backlink Checker
Enter any domain. Instantly see total backlinks, referring domains, authority score, and the top sites linking to it.
What our Free Backlink Checker shows you
Why backlinks still matter in 2026
Google has confirmed in multiple court hearings and patent filings that links remain one of the top three ranking signals, alongside content relevance and user-interaction data. Every page that ranks on page 1 for a competitive keyword has, on average, 3.8× more referring domains than the pages on page 2.
The reason is simple: a link from another website is an editorial vote of confidence that Google cannot fake. A site with 500 referring domains has been validated by 500 independent editors. A new site with 5 has not. Until that gap closes, no amount of on-page optimization will close it.
A backlink checker is therefore the most important diagnostic tool in SEO. It tells you exactly how big the gap is between you and the sites currently ranking, who is linking to your competitors, and which of your existing links are dragging your authority score down (toxic spam links from PBNs, shorteners, and link farms).
How to use this tool effectively
- Audit yourself first. Run your own domain. Note the authority score and referring-domain count. This is your baseline.
- Run your top 3 competitors. The gap between your numbers and theirs is the work ahead.
- Export their top referring domains. These are sites that have already shown they link to companies in your space. Reach out with a genuine reason for them to add you too.
- Check the dofollow ratio. If less than 50% are dofollow, the profile is suspicious — either spam attack or low-quality link building. Toxic links should be added to a disavow file.
- Re-check monthly. Backlink growth is a leading indicator. If your referring-domain count is flat for three months in a row, your SEO will be flat too.
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What's new in the Backlink Checker
- Added AI-powered diagnosis: plain-English read on your authority score and link quality.
- Doubled the top referring-domains preview from 5 to 10 rows.
- Switched to live index — backlink counts now refresh within 24 hours of crawl.
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Frequently Asked Questions
What is a backlink checker?
A backlink checker shows every external website (referring domain) that links to a given domain, along with metrics like total link count, authority score, and follow vs nofollow ratio. Backlinks are one of Google's top three ranking signals, so checking them is the first step in any SEO audit.
Is this backlink checker really free?
Yes. You can run up to 8 free domain lookups per hour with no signup, no card, no email. For unlimited checks and full referring-domain exports, create a free FreeSEO account.
How accurate is the backlink data?
Backlink data is sourced from a multi-trillion-link index (powered by Semrush) refreshed continuously. It is the same dataset agencies pay $140+/mo to access. Numbers will closely match Ahrefs and Moz, but small differences between providers are normal because each crawls the web independently.
What is Authority Score?
Authority Score (0–100) is a single number summarizing how strong a domain's backlink profile is. 0–20 = new site, 20–40 = growing, 40–60 = solid, 60–80 = strong, 80+ = top-tier (Wikipedia, NYTimes). To rank for competitive keywords, you generally need to be within 20 points of the sites already ranking on page 1.
Why are some of my backlinks 'nofollow'?
A nofollow link tells Google not to pass ranking credit. Common nofollow sources: social media, blog comments, forum posts, paid sponsored links. Nofollow links still bring referral traffic and brand exposure, but a healthy profile should be mostly dofollow (typically 60%+).
How do I get more backlinks?
The three reliable methods: (1) Create genuinely useful content (data studies, free tools, original research) that other sites want to cite. (2) Guest posts on relevant industry blogs. (3) Outreach to sites linking to competitors but not you. Avoid paid link networks and PBNs — Google penalizes them.
Can I check my competitor's backlinks?
Yes — that's the most powerful use of this tool. Run your top 3 competitors, export their top referring domains, and reach out to those same sites. If they're linking to your competitor, they may link to you too with the right pitch.