What is llms.txt? How to Create an llms.txt File for Your Website

llms.txt is a Markdown file placed in the root of a website that helps Large Language Models (LLMs) understand and access the most useful documentation. Instead of crawling thousands of pages, AI systems can use the file as a guide to find important content quickly. 

It is mainly used for developer documentation, product knowledge bases, API references and technical documentation. Although llms.txt is not an official web standard or a Google ranking factor, it is becoming a recommended practice for AI-friendly documentation in 2026.

LLMS.txt File Overview

As AI-powered search continues to grow, websites are no longer written only for human visitors or traditional search engines. Platforms such as ChatGPT, Claude, Gemini and Perplexity increasingly rely on high-quality documentation to answer user questions.

This is where llms.txt comes in.

It provides a simple way to highlight your most valuable documentation so AI models can understand your content more efficiently. If your business publishes API documentation, SaaS guides, developer docs or a knowledge base, adding an llms.txt file can improve content discovery and reduce unnecessary crawling.

What is llms.txt?

The llms.txt specification was introduced by Jeremy Howard, founder of Answer.AI, as an open proposal for AI-readable documentation.

Think of it as a table of contents for AI models.

Instead of asking an LLM to scan hundreds of pages, the file lists the documentation that matters most in a structured Markdown format.

Typical content includes:

• Product documentation
• API references
• Installation guides
• User manuals
• FAQs
• Tutorials
• Release notes

Unlike robots.txt, it does not control crawling. Instead, it helps AI systems understand where useful information is located.

Why is llms.txt Important?

As documentation grows, AI models may struggle to identify the most relevant pages.

An llms.txt file helps by:

• Improving documentation discovery
• Highlighting authoritative content
• Reducing duplicate information
• Making documentation easier for AI to process
• Supporting AI assistants that answer questions using your documentation

It is particularly useful for SaaS companies, software vendors, developer platforms and documentation websites.

How Does llms.txt Work?

The file is placed at:

https://example.com/llms.txt

 

When an AI crawler or documentation system supports the specification, it can read this file before processing the rest of your documentation.

A basic example:

# Company Documentation

 

## Main Docs

 

- https://example.com/docs

- https://example.com/api

- https://example.com/tutorials

 

## Optional

 

- https://example.com/blog

- https://example.com/changelog

 

The file uses simple Markdown, making it easy to create and maintain.

llms.txt vs robots.txt vs sitemap.xml

These files work together rather than replacing one another.

Who Should Use llms.txt?

An llms.txt file is useful for:

• SaaS companies
• Software products
• API providers
• Open-source projects
• Developer documentation
• Technical knowledge bases
• Product documentation websites
• AI tools
• Enterprise documentation portals

Simple brochure websites usually have little need for it.

How to Create an llms.txt File

Creating an llms.txt file is straightforward.

Step 1: Identify Important Pages

Include only your most useful documentation such as:

• Getting Started
• User Guides
• API Documentation
• Authentication
• Tutorials
• FAQs
• Release Notes

Step 2: Write the File

Use Markdown headings and organised links.

Step 3: Save as llms.txt

Place the file in your website's root directory.

Example:

https://yourdomain.com/llms.txt

Step 4: Keep It Updated

Whenever documentation changes, update the file to reflect new content.

Best Practices (2026)

Follow these recommendations:

• Use clear Markdown formatting.
• Link only high-quality documentation.
• Remove outdated URLs.
• Prioritise evergreen content.
• Organise links into logical sections.
• Keep the file easy to read.
• Update it after major product releases.
• Match the documentation hierarchy.

Common Mistakes

Avoid these errors:

• Including every website page
• Linking to marketing pages instead of documentation
• Broken links
• Duplicate URLs
• Outdated documentation
• Poor organisation
• Mixing unrelated content

The file should remain concise and focused.

Does llms.txt Improve SEO?

Indirectly, it may support your content strategy by:

• Improving documentation structure
• Making important content easier to find
• Supporting AI-assisted search experiences
• Enhancing user experience

However, it does not replace:

• Technical SEO
• Structured data
• Internal linking
• High-quality content
• XML sitemaps
• Robots.txt

Strong SEO still depends on creating helpful, authoritative and well-organised content.

llms-full.txt Explained

Some websites also publish llms-full.txt.

While llms.txt provides a summary of important resources, llms-full.txt can include more comprehensive documentation intended for AI consumption.

This file is optional and is not part of an official web standard, but some organisations use it to provide richer documentation for AI systems.

Conclusion

As AI-powered search continues to evolve, making documentation easier for machines to understand is becoming increasingly important. The llms.txt file offers a simple way to organise key documentation for Large Language Models without replacing existing SEO practices.

While it is not an official standard and not a confirmed Google ranking factor, it can improve the accessibility of technical documentation for AI systems and aligns with the broader trend of AI-friendly content.

If your website includes product documentation, API references or developer guides, adding an llms.txt file is a low-effort improvement that may help AI tools locate and understand your most valuable content more efficiently.

Frequently Asked Questions