Is llms.txt worth it in 2026?
An honest answer

What llms.txt is

llms.txt is a plain text file at the root of a website, so it opens at yourbusiness.com/llms.txt. Jeremy Howard proposed it in September 2024, on llmstxt.org. The file gives AI tools a short summary of a site and a list of links to its most useful pages, written in Markdown.

The aim is to help AI tools use a site's content when they answer a question, without wading through menus, scripts and adverts. It is a proposal, not an official standard. Nobody has to read it, and nobody has to write one.

For the basics and a template, see What is llms.txt, and do you need one?

Who reads it in 2026

This is where claims and evidence part ways. Here is what we could check.

• Google Search does not use it. A member of Google's search team said publicly in 2025 that Google does not support llms.txt and has no plans to. That was widely reported at the time.
• Google's Lighthouse tool now looks for it. Lighthouse, Google's free tool for testing web pages, has added an experimental agentic browsing section that includes an llms.txt check. Press coverage pointed out that this sits oddly with the search team's view. A check in a testing tool is not proof that any assistant reads the file.
• The big assistants have not said clearly. We could not find an official statement from OpenAI, Anthropic or Perplexity that their assistants read llms.txt when answering questions. Some vendors say they do. We have not seen evidence we would rely on.
• Its main home so far is software documentation. Some developer tools and documentation sites publish one, and some documentation platforms can create one for you.

So the honest summary is: a few tools may read it, the largest search engine says it does not, and nobody can show it changes whether an assistant mentions a business.

The case for adding one

• It is cheap. A short text file you can write yourself.
• It makes you write down what you do. One or two plain sentences about your business. That helps your homepage too.
• You are ready if more tools start reading it. If adoption grows, you will not need to do anything new.
• It changes nothing else. It does not replace or alter any other file or page on your site.

The case against spending much on it

• There is no good evidence yet that it changes whether an assistant finds or mentions you.
• It cannot help if the basics are missing. If crawlers are blocked, or your facts are hidden in scripts or images, llms.txt does not fix that.
• Paying someone to "optimise" it is hard to justify. A draft takes minutes.
• It is one more thing to keep current. An out-of-date file points tools at old pages.

How to decide

Work in this order. The first four are the things known to help machines reach and read a site.

1. Let the crawlers you want in. Check robots.txt and your host's bot settings. Where blocks hide
2. Put your key facts in the page text. Not only in scripts, images or PDFs.
3. Add structured data for your name, address, hours and contact details. Template
4. Have a sitemap at yourbusiness.com/sitemap.xml.
5. Then, if you like, add llms.txt.

If you have done the first four, llms.txt is a reasonable small extra. If you have not, start there.

What a good llms.txt looks like

Keep it short and true. A heading with your business name. One or two sentences on what you do and who for. Then links to the pages that matter: products or services, prices, how to buy or book, and contact details.

# Example Plumbing

> Boiler servicing, repairs and bathroom fitting for homes in Leeds and Wakefield.

## Key pages
- [Services and prices](https://example.com/services): what we do and what it costs
- [Book a visit](https://example.com/book): online booking
- [Contact](https://example.com/contact): phone, email and opening hours

Use Markdown links, in the form [text](address), as the proposal describes. Save the file at the top level of your site, so it opens at yourbusiness.com/llms.txt. Update it when you add or remove key pages.

What to be wary of

• Claims that llms.txt gets you into ChatGPT. Nobody can show that.
• Huge files. The idea is a short guide to your best pages, not a copy of your whole site.
• Text that differs from your pages. Say the same things your website says. If the two disagree, neither people nor machines know which to trust.

Make one in a minute

Our free llms.txt generator builds a first draft from the links on your homepage and your sitemap. It uses no AI. Edit the draft before you upload it, so the summary says what you actually do.

Written with AI. Checked against the llmstxt.org proposal and public reporting of Google's statements in October 2026.