About
About this validator
A fast, free tool that checks any site’s llms.txt against the official specification, tests that every link is reachable, and tells you what to improve.
What it checks
- Structure — a single H1 title, a blockquote summary, and H2 sections with properly formatted link lists.
- Link reachability — every linked URL is requested concurrently and graded OK, redirect, or broken.
- Best practices — HTTPS links, link descriptions, content type, and more.
Why link checking matters
Most validators only lint the text. A file can be perfectly formatted yet point at dead pages. We fetch each link so you find those dead ends before an AI crawler does.
Privacy & speed
No signup, no storage of your files beyond a short cache. The whole app is a single Go binary serving server-rendered pages, so it loads fast on any device.