Free tool
llms.txt checker
Does your site have an llms.txt? Is it optimized so AI engines (ChatGPT, Perplexity, Claude) actually cite you? Paste a URL — get a grade, issues, and one-line fixes.
What is llms.txt?
llms.txt is a markdown file at the root of your site (`/llms.txt`) that tells AI crawlers what your product does, how to use it, and where the entry points are. Think of it as the AEO equivalent of robots.txt — but instead of blocking bots, you're welcoming them with structured context.
Adoption surged in 2026 as ChatGPT, Perplexity, Claude, and Gemini started preferring sites with quality llms.txt for citations. A well-formed llms.txt can increase AI-engine citations 3-5x compared to none at all.
Minimum viable llms.txt
# Your Product Name ## What is it? One paragraph describing what you do and who you serve. ## Key Features - Feature 1 — one-line description - Feature 2 — one-line description ## API Base URL: https://api.example.com - POST /v1/scan — what it does ## Contact - https://example.com/docs - https://example.com