llms.txt is a proposed convention: a Markdown file at your site root listing your most important, machine-readable pages for LLMs. This free tool builds yours in a minute — and is honest about how much it matters: cheap insurance, not a lever. Ship it because it costs nothing, never instead of real structure.
/llms.txt at your site rootFill in the fields and hit Generate.
An llms.txt tells engines where to look. Whether they can actually read those pages is the bigger question — check your AI crawler access → — and whether they cite you is the real one: run a free page audit →