llms.txt validator and checker

Test your llms.txt file. Check a live site by URL: we test that the file exists, that it follows the format, and that its links resolve. Or paste the file to check its format.

Learn the format in the llms.txt guide. Want the full picture? Run the full agent readiness audit.

Who actually reads llms.txt?

Last reviewed: 2026-10-14

  • The Ahrefs llms.txt study (published June 2026, May 2026 logs, 137,210 domains) found that 97% of llms.txt files got zero requests in May 2026. AI retrieval bots made 1.1% of requests. Claude-Code was the #2 named AI bot fetching llms.txt.
  • On one site over about two months (May to July 2026), Evil Martians measured 23,300 requests from Claude Code. 76% of them were Markdown served through Accept: text/markdown content negotiation. ChatGPT-User got Markdown 0.1% of the time. The 76% figure is Markdown via content negotiation, not llms.txt fetches. It is also one site, so treat it as an anecdote.
  • Google says no special AI text files or markup are needed for its AI features. Its May 2026 guide calls llms.txt unnecessary.

Bottom line: llms.txt is worth having for coding agents and AI tools that fetch it. It is unlikely to change your visibility in Google or in chat assistants.

llms.txt Validator & Checker — test your llms.txt file | w2agent