llms.txt is one of the most talked-about — and most misunderstood — files in AI SEO. Here's what it actually is, whether it's worth your time, and how to write one.
What is llms.txt?
llms.txt is a plain-text (Markdown) file at the root of your domain (yoursite.com/llms.txt) that points AI tools to your most important content in a clean, structured way. Think of it as a curated map for language models — a short description of your business followed by links to your key pages, grouped by topic.
Do you actually need one?
Here's the honest answer most guides skip: for Google's AI features, no. Google stated in 2026 that it may crawl llms.txt but gives it no special treatment. Some non-Google AI tools do use it, and it's cheap to add — but its real value is indirect: the act of writing one forces you to audit which pages matter and surfaces crawler-blocking mistakes that silently hide you from AI. Add it, but don't expect it to be a magic ranking switch.
How to write an llms.txt
The format is simple Markdown:
- An H1 with your brand name.
- A blockquote with a one-paragraph summary of what you do.
- Topic sections (H2) each listing links with a short description.
A minimal example:
Example structure
# Your Brand> One-sentence description of your business and who you serve.## Services— links to your key service pages, each with a short note.## Locations— your main location pages.## Guides— your best content.## Contact— how to reach you, plus your email.
Keep it current, keep descriptions factual, and only link pages you'd genuinely want an AI to cite.
Common mistakes
- Treating it as a ranking hack. It isn't. It's a helper file, not a shortcut.
- Letting it go stale. An outdated llms.txt is worse than none — date it and update it.
- Blocking the crawlers anyway. llms.txt is pointless if robots.txt blocks GPTBot. Check both together.
Where llms.txt fits in the bigger picture
llms.txt is the smallest piece of getting cited by AI — the technical floor, not the whole building. Fact-rich answer-first content, entity schema and third-party mentions do the heavy lifting. See our AI Visibility service for the full method, run our free check to confirm your file and crawlers are set up right, or read the GEO strategy guide.
FAQ
Does llms.txt help with ChatGPT or Google?
Google gives it no special treatment for AI features. Some other tools use it. Its biggest benefit is forcing a content-and-crawlability audit.
Where do I put the llms.txt file?
At the root of your domain, served at yoursite.com/llms.txt as plain text.
Is llms.txt the same as robots.txt?
No. robots.txt controls what crawlers may access; llms.txt suggests what content matters. You need robots.txt correct first — a block there makes llms.txt moot.