How do I validate my llms.txt?

Use /tools/llms-txt-validator. Line-numbered errors with links to the spec.

Last updated 2 May 2026

The llms.txt spec at llmstxt.org has specific structural requirements (H1, summary blockquote, structured link sections). Easy to miss one.

  1. Open /tools/llms-txt-validator.
  2. Paste your URL (we fetch /llms.txt) or paste raw markdown.
  3. Output flags every line that breaks the spec: missing H1, missing summary blockquote, malformed link sections.
  4. Re-paste after fixes; most sites pass on the second run.

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