llms.txt: The New File That Tells ChatGPT How to Read Your Website

You already know robots.txt — the little file that tells search crawlers which pages they can index. In 2026, a new companion is emerging, and it could quietly shape whether AI tools recommend your business at all. It is called llms.txt, and it is a plain-text file that tells large language models like ChatGPT, Claude, and Perplexity how to read and summarise your website.

Here is why that matters more every month. Buyers increasingly skip Google entirely and ask an AI: 'who's the best agency for X?', 'what's a good tool for Y?'. Whether an AI can cleanly understand your site — and repeat the right things about you — is becoming its own ranking game. llms.txt is one of the first practical levers you can pull in it.

What llms.txt actually is

It is a Markdown file placed at the root of your domain — yoursite.com/llms.txt — that gives AI a clean, curated map of your most important content. Who you are, what you offer, and links to the pages that matter, written in plain language, without the navigation, pop-ups, ads, and JavaScript clutter that confuse a model scraping raw HTML.

Think of it as a cheat sheet you hand the machine: 'here is exactly what to know about us, and here are the pages to read for detail.' Instead of hoping an AI parses your site correctly, you tell it.

Why it matters for getting recommended

When someone asks an AI for a recommendation, the model answers from what it can confidently understand about you. A messy, script-heavy site is hard to parse, so the AI either gets you wrong or skips you. A clear llms.txt hands it the exact facts you want repeated — your services, your proof, your differentiators — in a form it can actually use.

This sits inside the broader discipline of optimising for AI answer engines, which we cover in how to get recommended by ChatGPT, Perplexity and Google AI. llms.txt is one concrete, do-it-this-afternoon piece of that puzzle.

Is it worth doing yet?

Honest answer: it is early. Adoption is not universal, not every model reads it yet, and it is not a magic ranking switch. But it costs almost nothing to add, carries zero downside, and positions you ahead of competitors in a channel that is only growing. In a shift as big as AI-mediated buying, cheap insurance on the upside is an easy call.

It also complements, rather than replaces, classic SEO. Google still drives most search traffic, and the fundamentals there still win — the same fundamentals behind ranking real content, which we cover in whether AI content hurts your rankings. Do both: rank on Google, and be readable by AI.

How to add one

Keep it simple and honest. List your core pages as Markdown links with a one-line description each, group them under headings (About, Services, Case Studies, Contact), and describe your business plainly — no keyword stuffing, which AI models discount anyway. Save it as llms.txt at your domain root, and update it when your offering changes. The whole thing takes an afternoon and quietly future-proofs how AI describes you.

Frequently Asked Questions

Does llms.txt replace SEO?

No. Classic SEO still drives Google, which is still the biggest source of search traffic. llms.txt is an additional signal for AI answer engines — a fast-growing but separate channel. The winning move is to do both.

Will adding llms.txt hurt my rankings?

No. It is a separate file that search engines ignore and AI tools use. There is no SEO downside to a clean, honest llms.txt — only potential upside in the AI channel.

Is anyone actually using it yet?

Adoption is early and not every model reads it, but major AI tools and forward-looking companies are adopting it. It is low-effort and low-risk, which is exactly why it is worth doing before your competitors do.

What should go in llms.txt?

A short description of your business, then curated Markdown links to your most important pages with one-line summaries — services, proof, about, contact. Clear and honest beats long and stuffed.

Want to know how an AI actually 'sees' your site today — how clear and readable it really is? Run it through our free AI website audit for an instant read on structure, clarity, and how well it communicates who you are.