Free Backlink Gap Checker
Compare two referring-website lists and find sources missing from your list. Deduplicate hostnames and export the backlink gap without a paid SEO account.
Free · No signup · Runs in your browser
How to use this tool
- Export or collect referring websites for your site and a competitor.
- Paste one source URL or hostname per line in each list.
- Review sources present only in the competitor list and qualify them manually.
Understand your results
This is a set comparison of supplied hostnames. URL paths are removed, www is normalised, and other subdomains remain distinct. For a fair comparison use the same provider, date and scope for both lists. A gap is a research lead, not a recommendation to pursue every site.
What this tool can and cannot tell you
The tool cannot prove a domain has never linked to you. Incomplete exports produce incomplete gaps. It does not discover competitor backlinks or measure authority.
Is my data uploaded?
The tool processes your inputs in your browser. We do not upload your files or send the text to an AI service. Results disappear when you reset or leave the page, so download anything you want to keep. Search links open Google only when you choose to follow them.
Built by BacklinkGrid Editorial Team · Updated 8 September 2026