Backlinks are still the backbone of how Google judges a site, and backlink checkers are how you see who links to you and who links to your competitors. The problem is that the best-known tools charge serious money — Ahrefs' paid plans start above $100/month — which is a tough sell if you run one blog or a small client site. The good news is that genuinely useful free backlink checkers exist, as long as you know what each one does well and where its free tier runs out.
1. Google Search Console — the accurate free baseline
Google Search Console is free, has no query limits, and reports backlinks directly from Google's own index. Under the Links report you can see your top linking sites, top linked pages, and top anchor text, and export the full list. The catch is obvious: it only covers sites you own and have verified. No competitor research, no domain authority scores. But for monitoring your own site's link profile, nothing free beats it — because no third-party crawler matches Google's index coverage of your own pages. Check the Links report monthly, export the list, and watch for sudden drops that suggest lost links worth recovering.
2. Ahrefs Free Backlink Checker — top 100 links, any domain
Ahrefs runs a free backlink checker that shows the top 100 backlinks for any domain or URL, no account required. Because it draws on Ahrefs' link index — one of the largest in the industry — the data is fresh and the referring domains you see are usually the ones that matter most. It also shows domain rating and anchor text for each link. The limit is real: 100 links is a snapshot, not a full profile, and you get no filters, exports, or historical data. Still, for a quick "who links to this competitor" check, this is the most generous free look at any domain on the internet.
3. Ahrefs Webmaster Tools — free Ahrefs data for your own sites
Ahrefs Webmaster Tools is a separate free product aimed at verified site owners. Sign up, verify ownership, and you get backlink data and site-audit results for your own domains, powered by the same index behind the paid product. The tradeoff mirrors Search Console: only your sites, never competitors'. If you combine Search Console (Google's view) with Ahrefs Webmaster Tools (Ahrefs' view), you get a remarkably complete picture of your own link profile for zero cost. For freelancers managing their own sites, this pairing replaces a surprising amount of a paid subscription.
4. Moz Link Explorer — 10 free queries a month
Moz's Link Explorer lets you run 10 free queries per month, no account needed for the first look, and returns inbound links along with Domain Authority and Spam Score for the linking domains. Domain Authority remains one of the most widely cited comparative metrics in the industry, even by people who argue about its flaws, and Spam Score gives you a quick triage signal for low-quality links. Ten queries a month is tight — research five competitors and half your allowance is gone — so use it for shortlists, not exploration. Check your top pages once, note the strongest referring domains, and spend your queries deliberately.
5. Semrush free backlink checker — top 25, no signup
Semrush offers a free backlink checker that shows the top 25 backlinks for any domain without requiring signup. Twenty-five links is a thin sample, but the data comes from Semrush's 43-trillion-link database, so the top of the list is trustworthy. Where Semrush's free tier is genuinely useful is toxic-link review: its link toxicity scoring is among the strongest in the industry, so if you suspect spammy links are dragging a site down, the free sample plus a trial gives you a direction fast. For routine competitor research the sample is too small, but for spot-checks it earns a bookmark.
6. Ubersuggest — 3 free searches a day
Neil Patel's Ubersuggest gives you three free searches per day, covering keywords, traffic estimates, and a basic backlink overview with difficulty scores. The backlink data is lighter than Ahrefs or Semrush — fine for spotting a competitor's strongest referring domains, not for audits. The three-search cap means this is a confirmation tool, not a research tool: you come in with a hypothesis ("did this competitor get a new press link?") and burn one search to check it. If you use it daily for quick competitor pulses, the limit actually disciplines you into focused checks.
7. SEO Review Tools — 100 free backlinks with CSV export
SEO Review Tools' backlink checker pulls the top 100 unique backlinks for a domain and, unlike most free options, lets you export them as a CSV. That export matters: once the data is in a spreadsheet you can dedupe, sort by authority, and build an outreach list — workflows that stay locked behind paywalls in most competitors' free tiers. Freshness lags behind the paid giants, so treat it as a discovery source rather than a monitoring source, and verify important findings against Ahrefs' free checker or Search Console.
8. Majestic — free tier for Trust Flow checks
Majestic's free tier is deliberately limited, but it exposes the metrics Majestic is famous for: Trust Flow and Citation Flow, plus a sample of referring domains and anchor text. Trust Flow is useful because it scores link quality rather than quantity — a domain with high Trust Flow links from trusted seed sites, which makes it a good quick filter when prospecting link partners. You will hit the free limits almost immediately on real projects, so treat Majestic as a quality-check bookmark rather than a daily driver. Run promising prospect domains through it before you spend time on outreach.
Honorable mentions: Bing Webmaster Tools and Small SEO Tools
Bing Webmaster Tools is underrated for link data: it gives verified site owners free backlink reports plus a site scan that flags broken links, all without the volume caps of Google's tools. The index is smaller than Google's, so counts run lower than reality, but the data is real and free. Small SEO Tools and OpenLinkProfiler offer unlimited no-signup backlink checks; their databases are shallower, but for a fast anonymous sanity check they beat signing up for yet another free trial.
A practical free workflow that actually works
No single free tool replaces a paid suite, but stacked together they cover most jobs. Use Google Search Console plus Ahrefs Webmaster Tools monthly for your own site's complete link picture. Use Ahrefs' free checker for quick competitor snapshots and SEO Review Tools when you need an exportable list. Keep Moz's 10 monthly queries for authority scoring on shortlisted prospects, Ubersuggest's 3 daily searches for quick confirmations, and Majestic's free tier for Trust Flow quality checks. When one tool's limits bite, that is your signal about which paid plan — if any — would actually earn its money.
Key takeaways
- Google Search Console and Ahrefs Webmaster Tools together give you a complete free backlink picture of your own site.
- Ahrefs' free checker shows the top 100 backlinks for any domain with no signup — the most generous free competitor look available.
- Moz gives 10 free queries/month with Domain Authority and Spam Score; Ubersuggest gives 3 free searches/day.
- Semrush's free checker shows the top 25 links with no signup; SEO Review Tools gives 100 links with CSV export.
- Stack tools by job — monitor with Search Console, snapshot competitors with Ahrefs, triage quality with Majestic — instead of hunting for one free tool that does everything.