What Is llms.txt and Do You Need One?

By Adev Aarons, Founder of Specularis · Updated July 2026

An llms.txt file is a plain text file at the root of your site, at yoursite.com/llms.txt, that tells AI models what your business is and points them to your most important pages. Think of it as a clean map you hand the AI so it does not have to piece you together from scattered marketing copy. You do not strictly need one to get cited, but it is a low-effort file that helps AI understand you faster, and it is quickly becoming a standard.

What does an llms.txt file actually do?

It gives AI a curated summary of your site in one place. Instead of an AI crawling dozens of pages and guessing what matters, llms.txt states in plain language what you do, who you are, and which pages are the ones worth reading. It is written in simple Markdown, so it is easy for both humans and models to parse.

The point is clarity. Your website is built for people, full of design, navigation, and marketing language. llms.txt strips that down to the facts an AI needs: your name, your focus, and links to your key resources.

What goes in an llms.txt file?

A good llms.txt is short and structured. At minimum it usually includes:

A title and one-line description of what your business or site is.

A short summary paragraph in plain language, stating who you are and what you do.

Curated links to your most important pages, grouped by section, with a sentence describing each.

Optional context like key products, services, or documentation the AI should prioritize.

The format is Markdown. Keep it honest and focused. This is a map, not a sales page.

Do you actually need an llms.txt file?

You do not need one to be cited by AI, and it is not yet universally read by every model. But it is worth adding for three reasons: it is fast to create, it removes ambiguity about who you are, and it signals that your site is built with AI in mind. As adoption grows, sites that already have a clean llms.txt are ahead of the ones scrambling to add it later.

It is not the pillar that makes or breaks your AI visibility. Crawler access, schema, answer-first content, and off-site corroboration do far more heavy lifting. But llms.txt is a cheap, sensible addition to the technical foundation pillar.

How do you create and add an llms.txt file?

Write a plain Markdown file with your site name, a short summary, and grouped links to your key pages. Save it as llms.txt. Upload it to the root of your site so it loads at yoursite.com/llms.txt. On most site builders and hosts you can add it as a static file or through a custom-code or redirects setting. Once it is live, load the URL in a browser to confirm it returns the plain text.

How does llms.txt fit into overall AI visibility?

It is one piece of the technical foundation pillar, which is one of the five pillars that decide whether AI finds, understands, and cites you. If you want the full map, start with the AI Visibility hub guide.

The fastest way to see whether your llms.txt and the four bigger pillars are in place is to check them all at once. Run your free AI visibility audit here. No credit card, results in your inbox.

Frequently asked questions

What is an llms.txt file?

An llms.txt file is a plain Markdown file at the root of your site that tells AI models what your business is and links them to your most important pages. It gives AI a clean summary instead of leaving it to guess from your marketing copy.

Do I need an llms.txt file to get cited by AI?

No, it is not required and not yet read by every model. But it is fast to add, removes ambiguity about who you are, and is becoming a standard, so it is a sensible low-effort addition.

What should go in an llms.txt file?

A title and one-line description of your site, a short plain-language summary of who you are and what you do, and curated links to your most important pages grouped by section, each with a short description.

Where do I put the llms.txt file?

At the root of your site so it loads at yoursite.com/llms.txt, the same location as your robots.txt. Upload it as a static file or through your host’s custom-code setting, then load the URL to confirm it returns plain text.

Adev Aarons is the founder of Specularis, an AI visibility company that gets founders and businesses cited by ChatGPT, Claude, and Perplexity. Run a free audit.