What is llms.txt and does your business need one?

A quick honesty warning before you spend any time on this: llms.txt is genuinely useful, but it’s nobody’s silver bullet, and plenty of “you MUST have llms.txt” advice oversells it. It’s a young, voluntary standard from 2024 that no AI company is required to read. That said, it costs nothing and takes ten minutes, so it earns its place, as long as you treat it as a bonus, not a strategy.

An llms.txt file is a plain-text file you place at the root of your website (yourdomain.com/llms.txt) that tells AI assistants what your business does, what you offer, and which pages matter most, written in clean, simple language they can read easily. Think of it as a summary card for ChatGPT, Perplexity, Gemini and Google’s AI, designed to help them describe your business correctly.

What an llms.txt file actually contains

It’s not code. It’s readable text in a lightweight format called Markdown. A typical file includes:

• A one-paragraph summary of what your business does and who it serves.
• What you offer, services, products, plans, prices.
• Key pages, links to your homepage, services, pricing and contact, each with a short description.
• An honesty note, anything you want stated accurately (areas served, what you don’t do).

The goal is clarity. AI models scrape messy HTML full of menus, scripts and pop-ups. An llms.txt strips that away and hands them the facts directly.

How it differs from robots.txt and a sitemap

People confuse these three files. They do different jobs:

A sitemap helps machines find your pages. An llms.txt helps them understand what those pages mean. They’re complementary, not alternatives.

Does your business actually need one?

Honestly: it’s helpful, not essential. AI assistants can already read your normal pages. An llms.txt makes their job easier and reduces the chance they describe you wrongly, but it’s one small piece of a bigger picture.

It matters more if:

1. Your website’s built with heavy JavaScript that bots struggle to read.
2. Your offering’s complex (many services, tiers or locations) and easy to get wrong.
3. You want AI tools to quote specific, accurate facts, prices, service areas, what you do and don’t do.

It matters less if you run a simple, clean, text-rich site that already states the basics plainly. In that case, focus first on making your real pages clear and quotable, see make your website quotable by AI.

What to put in it (and what to avoid)

If you add one, keep it honest and current:

• Do state your real services, prices and areas served.
• Do link your most important pages with a one-line description each.
• Do include anything you want quoted accurately, such as “no setup fee” or “UK-only”.
• Don’t stuff it with keywords or repeat the same phrase, AI models notice and discount it.
• Don’t make claims you can’t back up. If an assistant quotes a false promise from your file, that’s worse than saying nothing.
• Don’t set it and forget it. Update it when prices or services change.

How this fits a wider AI-search strategy

llms.txt is one signal among many. To be cited and recommended by AI tools, you also need clear page structure, consistent business details across the web, schema markup, and content that directly answers the questions your customers ask. That broader work is called GEO (generative engine optimisation), see what is GEO.

We set up llms.txt, schema markup and AI-friendly content as part of our GEO work on the Complete and Premier plans, so your business is described correctly across ChatGPT, Perplexity, Gemini and Google AI Overviews. See what’s included on the pricing page.

To start small today: write a clean, honest llms.txt, save it as plain text, and upload it to your site’s root folder so it loads at yourdomain.com/llms.txt. Then make sure your actual pages say the same things just as clearly, that’s where the real value lives.