How is llms.txt different from robots.txt?

robots.txt is an access-control rule: it tells crawlers what they can or can't fetch, and breaking it blocks access outright. llms.txt has no such power — it's a suggestion about what matters on your site, not an enforceable gate.

Does Google require llms.txt?

No. Google's own generative AI search optimization guide states that special files like llms.txt aren't needed to appear in AI Overviews or AI Mode. That's Google's stated position specifically, not proof that llms.txt is useless everywhere.

Is llms.txt an official standard?

No. It's a community convention proposed by Jeremy Howard of Answer.AI in September 2024 via llmstxt.org — not a standard ratified by the W3C or IETF. Adoption and interpretation still vary by site and by AI system.

What Is an llms.txt File?

llms.txt is a plain text file you place at your site's root to tell AI directly what your site covers and which pages matter most. Where robots.txt sets rules for what crawlers can access, llms.txt simply flags what's important — and whether an AI follows that is up to the AI itself.

Updated 2026-07-11

Frequently asked questions

What Is an llms.txt File?: It's a plain markdown file placed at your site's root that summarizes your site's purpose and key pages for AI. Unlike robots.txt, which controls crawler access, llms.txt only points AI toward what's important — whether it's followed is entirely up to the AI reading it.
How is llms.txt different from robots.txt?: robots.txt is an access-control rule: it tells crawlers what they can or can't fetch, and breaking it blocks access outright. llms.txt has no such power — it's a suggestion about what matters on your site, not an enforceable gate.
Does Google require llms.txt?: No. Google's own generative AI search optimization guide states that special files like llms.txt aren't needed to appear in AI Overviews or AI Mode. That's Google's stated position specifically, not proof that llms.txt is useless everywhere.
Is llms.txt an official standard?: No. It's a community convention proposed by Jeremy Howard of Answer.AI in September 2024 via llmstxt.org — not a standard ratified by the W3C or IETF. Adoption and interpretation still vary by site and by AI system.