Free · updated for $2026
Free link building tools
Free SEO tools for the part of the job that comes before buying a link: knowing which links you have, which ones your competitors have, and what an outlet is worth before you publish on it.
The tools
All free, no card required.
What each one is for
Different moments in a link campaign.
Before you start: what you have
The checker on your own domain gives you the baseline: how many domains link to you, with what authority, and where the gaps are.
When planning: what competitors have
The same checker on a competitor tells you where their links come from, and which of those outlets you can publish on.
When choosing an outlet: what it is worth
The extension shows you the metrics of the site you are on, so you can rule out the ones not worth it in seconds.
When reporting: what changed
Running the checker again after a campaign shows the new referring domains, which is the simplest honest report of what the links bought.
Frequently asked questions
What people ask about the tools.
- Yes. The checker works without signing up and the extension is free. There is a daily query limit so the service can stay free for everyone.
- From a third-party link database that crawls the web continuously. No tool sees every link that exists, so read the result as a reliable sample rather than an exact total.
- Yes, and it is the most common use: seeing where the links of whoever outranks you come from, and which of those outlets you can publish on.
- Not for the checker. An account is only needed if you want to buy publications on the outlets it finds for you.
