What is llms.txt, and does a small business need one?

Update·22 October 2026·7 min read

What is llms.txt? It’s a plain-text file that sits at the root of a website, for example yourbusiness.com.au/llms.txt. It gives AI tools a short, tidy summary of what the site is and which pages matter most. It is a proposal, not an official standard, and it is not a Google ranking factor. Most small business websites don’t need one to be found. It is cheap to add, and harmless as long as it is kept accurate, which is why we publish one on our own site.

You may have read about it online or heard it in an SEO pitch. This is the honest version: what the file is, what Google says about it, what to put in one, and what it won’t do for your business.

What is llms.txt?

The idea comes from a proposal published at llmstxt.org. Large language models are the technology behind tools like ChatGPT, Claude and Gemini. They can only read so much at once, and a normal web page is cluttered with menus, scripts and footers. The proposal suggests websites add one file, written in Markdown (a simple text format), that points AI tools to the most useful pages in plain words.

The format is simple. The file starts with the site or business name as a heading, which is the only required part. A short summary comes next, then any brief notes, then sections of links. Each link has a few words saying what the page covers. A section called “Optional” can hold pages that a tool can skip if it’s short on space.

Some sites, ours included, also publish a longer companion file called llms-full.txt that writes more of the detail out in full. That is a convention some sites follow, not the heart of the proposal.

It’s worth being clear about what llms.txt isn’t. It is not robots.txt. Google explains that robots.txt tells crawlers which parts of a site they can access, mainly so a site isn’t overloaded with requests (Google’s introduction to robots.txt). llms.txt grants or blocks nothing. It is a reading guide, and any tool is free to ignore it.

Is llms.txt a Google ranking factor?

No. Google’s guidance on AI features in Search covers AI Overviews and AI Mode, and it says there are no extra requirements to appear in them. Pages need to be indexed and eligible to show a snippet in normal search. Google also says you don’t need to create new machine-readable files or special markup for these features (Google Search Central: AI features and your website).

Google’s May 2025 article on doing well in AI search makes a similar point. Focus on helpful, original content that people will find useful and a good page experience. Make sure Google can crawl and index your pages, and keep your Business Profile up to date (Google’s guide to succeeding in AI search).

Outside Google, the picture is less clear. We are not aware of any major AI assistant saying publicly that it uses llms.txt to decide which businesses to recommend. Some developers and AI tools do use these files, mostly for software documentation. For a local trade, café or shop, there’s no evidence yet that the file changes who gets named.

Why we publish one anyway

JB Digital Barossa publishes an llms.txt file and a longer llms-full.txt. We treat them as a tidy-up, not a growth tactic. They are small text files that sit alongside the rest of the site. Any tool that does read them gets a correct summary of who we are, where we work and what we charge.

What matters to us is accuracy. Our files are rewritten automatically from the same source that holds the prices and figures on our website, so the numbers in them match the site. When a price changes on our website, it changes in the llms files too. An llms.txt with old prices or an old phone number is worse than having none at all.

What to put in an llms.txt for a small business

If you decide to add one, keep it short and factual. A small business version only needs a handful of things:

Your business name: use it as the heading, exactly as it appears on your Google Business Profile and signage.

A one-line summary: say what you do, where, and for whom. For example, “a family-run electrician serving Gawler and the Barossa”.

Your contact details: list your phone number, email and service areas, matching your website and profile.

Your main pages: link your home page, each service page, pricing, the areas you serve and contact. Add a few words on what each one covers. A line might read “[Pricing](https://yourbusiness.com.au/pricing/): fixed prices for each package”.

Proof you can stand behind: link to your reviews page or case studies rather than making claims you couldn’t back up.

Optional extras: put blog posts, FAQs or policies in an “Optional” section at the end.

Leave out anything you wouldn’t say on your homepage. Don’t stuff it with keywords, don’t list every suburb in the state, and don’t write claims like “best plumber in Adelaide”. If an AI tool does read the file, it will weigh it against everything else it can find about you.

What llms.txt will not do

It’s easy to over-sell a new file, so here is the plain list. An llms.txt will not:

Move your Google rankings: Google has said no special files are needed for its AI features, and normal SEO practice applies.

Make ChatGPT or Claude recommend you: AI answers draw on many sources across the web, not on one file on your own site.

Stop AI tools using your content: the file doesn’t block anything. Crawler access is requested through robots.txt, and Google notes that not every crawler follows it. Google’s robots.txt guide also says that keeping a page out of Google takes a noindex tag or a password, not robots.txt.

Fix a weak website: if your service pages are thin or your details don’t match across the web, the file only summarises the problem.

If anyone offers to sell you llms.txt as a way to get recommended by AI, ask to see the evidence.

What helps you show up in AI answers

What helps in AI answers is mostly what helps on Google. That’s good news, because the same work also helps people searching the normal way find and contact you.

Make sure Google can crawl and index your pages, and check that your robots.txt isn’t blocking anything important. Give each main service its own page that says what you do and where, in plain words. Keep your business name, phone number and address or service areas the same everywhere. Keep your Google Business Profile complete and current, and collect genuine reviews. Publish things only you can say, such as real prices, real photos of your work and answers to the questions customers ask.

We go further into this in how Barossa businesses get recommended by AI, including a two-minute check you can run on your own business.

To see where you stand today, try the free AI visibility check run by our SEO division. It asks Claude, an AI model with web search, three questions a customer might ask, then shows whether your business was named. It’s one AI’s answer at one moment, so treat it as a snapshot rather than a score. Adelaide businesses that want ongoing help can read about our AI search optimisation work.

Want a second opinion on your site?

Every website we build includes a full SEO set-up, Google Search Console, local SEO and a monthly report. It also includes AEO and GEO, which means shaping your pages so search engines and AI answers can understand them. Our pricing page shows what each build includes. If you’d like an llms.txt on your site as well, ask us and we’ll tell you honestly whether it’s worth the time. Get in touch and tell us what your business does.