llms.txt: The Simple File Helping AI Systems Better Understand Your Website

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In December 2024, fast.ai founder Jeremy Howard proposed a new open standard called llms.txt — a Markdown-formatted file placed in a website's root directory to help AI systems understand a site's structure and key content. Analogous to robots.txt for search engines, the file provides AI tools with a concise, structured overview including page links, company descriptions, and optional usage guidance. The standard has gained backing from major platforms such as Reddit, Cloudflare, Akamai, and Creative Commons, and is supported by AI tools including Claude and Perplexity. Adopting the standard is optional and takes only a few minutes to implement, with no rebuilding required for platforms like Next.js or WordPress. Importantly, llms.txt acts as a pointer to valuable content rather than a replacement for it, and its presence signals that a company is proactively managing how AI systems perceive it.

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