Your site has an /llms.txt. A retrieval engine just fetched it. Did it parse cleanly, or did the engine silently skip half of it because the structure was broken? This validator checks every structural signal in the llmstxt.org spec — H1 title, blockquote description, H2 sections, link-list formatting, absolute HTTPS URLs — and tells you exactly what to fix. Reality check: as of mid-2026 no major answer engine (Google included) confirms using llms.txt as a production ranking or retrieval input, so treat a clean file as good hygiene and cheap future-proofing, not a guaranteed visibility lever.
Read the story behind this tool: LLMs.txt Validator — Why Most Published llms.txt Files Silently Fail →
Option A: fetch /llms.txt from a live URL. Option B: paste the file contents. Both work; fetch mode also reports the HTTP status + content-type.