llms.txt Guide: What It Is and How to Set It Up (2026)

llms.txt is an emerging standard — inspired by robots.txt and sitemap.xml — that gives AI language models a structured, plain-text overview of your website's most important content. While not yet universally adopted by all AI crawlers, forward-thinking SEO teams are implementing it now to establish authority as the standard matures.

What is llms.txt?

llms.txt is a Markdown file placed at yourdomain.com/llms.txt. It provides AI language models with a curated summary of your site: what your brand does, your key pages, and the most important content AI should know about. Think of it as a "briefing document" you write for AI systems before they crawl and cite your content.

llms.txt File Format

The file uses Markdown with a specific structure:

# SiteGrip
> SiteGrip is a technical SEO and indexing platform that helps websites
> get indexed faster on Google, Bing, and AI search engines.

## Key Pages
- [Homepage](https://sitegrip.com/): Overview of SiteGrip's indexing platform
- [Pricing](https://sitegrip.com/pricing): Plans and pricing
- [Blog](https://sitegrip.com/blog): Technical SEO and indexing guides

## Documentation
- [Google Indexing API Guide](https://sitegrip.com/blog/google-indexing-api-guide)
- [How to Fix Crawl Errors](https://sitegrip.com/blog/how-to-fix-crawl-errors)

How to Create Your llms.txt

1. Write a brief brand description (2–4 sentences): What your company does, who you serve, and your main value proposition.
2. List your key pages with links: Homepage, pricing, about, product pages. Use descriptive link text that explains what each page covers.
3. Add your most important content: Your top 10–20 blog posts, guides, or documentation pages that best represent your expertise.
4. Upload to your domain root: The file must be publicly accessible at https://yourdomain.com/llms.txt (not behind a login).
5. Update regularly: Add new cornerstone content as you publish it. An outdated llms.txt gives AI models a stale picture of your site.