llms.txt is a small Markdown file at the root of your site that gives AI tools a short guided tour: who you are, what you do, which pages matter. It is an emerging convention that some AI tools read. Google has said it does not use it, so treat it as a cheap experiment, not a requirement. We check whether you have one, and build you a valid one either way. No email.
free / no email / ~30s
The format comes from the llms.txt proposal: a Markdown file with your site name as the heading, a one line description as a quote, and lists of links. Everything below runs in your browser. Nothing you type is sent anywhere.
The file builds here as you type. It stays in your browser; we never see it.
# Your Site Name. It is the only required part of the format.> line tells an AI tool what your site is in one sentence. Write it the way you would tell a stranger.yourdomain.com/llms.txt, the same place robots.txt lives. Anywhere else and nothing will find it.An llms.txt file is a plain Markdown file published at the root of a website, at /llms.txt, that gives AI tools a short guide to the site: the site name as a heading, a one line description as a blockquote, and lists of links to the pages that matter most. It is a community convention proposed in 2024, not an official web standard, and support varies from tool to tool.
No. Google's AI search guidance says you do not need to create new machine readable files, AI text files, or Markdown to appear in generative AI search, and Google has said it does not use llms.txt. Some non-Google AI tools do read the file, so publishing one is a low cost experiment with a possible upside and no downside. Any tool that fails your site for a missing llms.txt is scoring folklore, not fact.
Upload it to the root of your website so it loads at yourdomain.com/llms.txt, the same location where robots.txt lives. Serve it as plain UTF-8 text, not as an HTML page. Then open that address in a browser: if you can read the file there, so can any tool that looks for it. The checker at the top of this page confirms it from the outside.
This file is one small, optional signal. Whether search engines and AI assistants can actually reach, read and quote your site comes down to the fundamentals: crawler access, content that survives without JavaScript, structured data that parses, an answer worth lifting. The full AuditLamp audit scores all 116 documented checks in one free scan, full score on screen, no email taken. We make money on the watching and the fixes, not your inbox.