# LLMs.txt

> What the llms.txt file is, how it shows AI models your important content in a structured way, and why it makes your digital foundation machine-readable.

Synonyms: llms.txt file

llms.txt is a simple text file you place in the root directory of your site – similar to the well-known robots.txt, but for AI language models instead of search-engine crawlers. It summarises which content on your site matters, how it connects and where the reliable facts are.

The point behind it: AI assistants don't have to fight their way through layout, menus and scripts, but get a clear, machine-readable map of your content. That lowers the chance of a model spreading outdated or wrong information about you.

llms.txt is no magic bullet, but one building block of a machine-readable foundation. It works best when the linked content is itself cleanly structured and up to date. What comes after the file is covered in llms.txt is only step one.

What happens when the file is there but sloppy, now that Lighthouse audits it: [a bad llms.txt is worse than none at all](https://btlabs.dev/en/posts/check-llms-txt-bad-file).

How llms.txt fits with the other offerings for AI systems: [AI discoverability (GEO)](https://btlabs.dev/en/ai-discoverability).

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Source: https://btlabs.dev/en/glossary/llms-txt
Last-Modified: 2026-09-25T11:09:09.228Z
Languages: [de](https://btlabs.dev/llms/de/glossary/llms-txt) · [it](https://btlabs.dev/llms/it/glossary/llms-txt)
See also: [llms.txt](https://btlabs.dev/llms.txt) · [ai.txt (Policy)](https://btlabs.dev/ai.txt) · [identity.json](https://btlabs.dev/identity.json)