Free tool
llms.txt Validator
Paste your llms.txt and check it against the spec in your browser. No signup, nothing uploaded.
Paste an llms.txt above (or load the example) to validate it.
What is llms.txt?
llms.txt is a proposed standard (llmstxt.org) — a Markdown file at the root of your domain (/llms.txt) that gives large language models a clean, curated view of your site: a title, a short summary, and the key links worth reading. It helps AI answer engines understand and cite your content correctly.
What this validator checks
- Exactly one H1 title (the site or project name).
- A recommended
>summary blockquote. - Well-formed H2 sections containing Markdown link lists.
- Absolute
http(s)URLs crawlers can resolve.
FAQ
What is llms.txt?+
llms.txt is a proposed standard (llmstxt.org) — a Markdown file at the root of your site that gives large language models a clean, curated summary of your content and the key links worth reading, so AI answer engines understand your site better.
What does this validator check?+
It checks the structure: a single H1 title, a recommended blockquote summary, well-formed H2 sections, and that those sections contain Markdown link lists with absolute URLs. It flags errors, warnings and tips.
Is my file uploaded anywhere?+
No. Validation runs entirely in your browser — your llms.txt never leaves your device and is not sent to any server.
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