Quick answer
llms.txt is a community proposal, introduced in 2024, for a Markdown file at the root of a website that summarizes the site and links to its most important content in a format that language models can read easily. It does not control crawling or training, it is not part of robots.txt, and major search engines have not said they use it for ranking or AI answers. It can be a low-cost addition, especially for documentation sites, but it is not a substitute for crawlable, well-structured pages.
Key takeaways
- llms.txt is a proposal, not an adopted web standard.
- It does not block or permit crawling; robots.txt does that.
- Google has not said it uses llms.txt for Search or AI Overviews.
- It is most useful for documentation and developer content.
Who this guide is for
Website owners and marketers who have heard that llms.txt is required for AI visibility and want an accurate picture.
What llms.txt is
The llms.txt proposal, published at llmstxt.org in 2024 by Jeremy Howard of Answer.AI, suggests placing a Markdown file at /llms.txt. The file begins with the site or project name, a short summary, optional notes and then sections of links to key pages with brief descriptions. A related idea is offering Markdown versions of pages. The goal is to give language models a concise map of important content, since full HTML pages contain navigation, scripts and layout that consume model context.
What it is not
llms.txt is not a replacement for robots.txt and has no role in allowing or blocking crawlers. It is not a sitemap for search engines and does not affect indexing. It is not a ranking factor in Google Search; Google has stated that no special files are needed to appear in its AI features. Adding llms.txt will not by itself make ChatGPT, Gemini or Perplexity cite your business.
Who uses it today
Adoption is strongest among developer tools and documentation sites, where users paste documentation into AI coding assistants or tools fetch it on request. Some AI-related tools read llms.txt when explicitly directed to a site. Public statements from major search and AI providers about using it for general web answers have been limited or negative, and server logs on many sites show few requests for it. Check current provider documentation, as this may change.
When it might be worth adding
If you publish product documentation, APIs, technical guides or a large knowledge base, an llms.txt file can help developers and AI tools find the right pages quickly. For a typical business website, it is low effort to create a simple version linking to key service pages, guides and company information, so there is little harm in adding one. Just do not divert budget from fundamentals because of it.
How to write one well
Keep it accurate and short: a one-paragraph description of the organization, followed by grouped links to the most useful canonical pages with one-line descriptions. Link to pages that are publicly accessible and indexable. Avoid stuffing it with keywords or marketing claims, which add no value for a model trying to understand your content. Update it when key pages change, or generate it from your CMS to stay in sync.
What matters more
AI systems that cite websites mostly rely on search indexes and their own crawlers reading normal HTML. The factors that matter more are crawl access for relevant bots, content present in HTML without requiring JavaScript, clear answers to buyer questions, consistent company information, accurate structured data and third-party reputation. Treat llms.txt as optional metadata layered on top of these.
Track whether it is used
If you add llms.txt, monitor server logs for requests to it and note which user agents fetch it. This gives evidence for your own site rather than relying on industry claims. Review periodically whether major providers have announced support. If no meaningful systems request it, keep it minimal and focus effort elsewhere.
Scope checklist
- Do you publish documentation or technical content that AI tools fetch?
- Are your key pages crawlable and indexable already?
- Is robots.txt configured separately for AI crawlers?
- Who will keep llms.txt accurate if you add one?
- Are you monitoring requests to the file?
Frequently asked questions
Is llms.txt required for AI SEO?
No. It is an optional proposal. Crawlable, well-structured content and correct crawler access matter far more.
Does Google use llms.txt?
Google has not announced using llms.txt for Search or AI Overviews and states no special files are needed for its AI features.
What is the difference between llms.txt and robots.txt?
robots.txt tells crawlers which paths they may crawl under a standardized protocol. llms.txt is a proposed summary file listing important content for language models and does not control access.
Sources and implementation references
- llms.txt proposal
The original specification and examples.
- Google Search Central: AI features and your website
States that no special requirements or files are needed for AI features.
Prepared with AI assistance as an engineering decision guide. Examples are illustrative unless explicitly labelled as an internal implementation. No independent expert review or customer outcome is claimed.
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