What Is llms.txt? A Practical Guide for Small Business Websites

26 September 2026

If you've started seeing llms.txt mentioned alongside SEO and AI visibility advice, here's what it actually is, in plain terms, and whether it's worth your time to add one.

The short version

llms.txt is a plain text file you publish at the root of your website (yoursite.com/llms.txt), written specifically for AI systems rather than human visitors or search engine crawlers. It gives an AI assistant a short, curated summary of who you are, what you do, and which pages on your site matter most, in place of the assistant having to guess from your homepage's marketing copy.

Why it exists

Search engines have crawled and indexed the web for decades using their own methods. AI assistants (ChatGPT, Claude, Perplexity and others) work differently: many of them fetch a small number of pages at query time rather than maintaining a full index, and they have far less context to work with per site than a search engine does. A well-written llms.txt file gives them a head start: a concise, human-curated summary instead of an automated guess pieced together from whatever text happens to be on your homepage.

It does not guarantee an AI assistant will recommend you. It removes one source of ambiguity about who you are and what you do, in the same way a well-written meta description helps a search engine understand a page, without guaranteeing a top ranking.

What actually goes in one

A typical llms.txt file is short: a heading, a one-paragraph summary, and a short list of key pages.

Keep it factual and current. There is no benefit to padding it with marketing language an AI assistant has no use for, and a stale file (wrong services, an old address) is arguably worse than no file at all, since it's a source you've explicitly told the assistant to trust.

How to publish one

The file needs to be reachable at exactly yoursite.com/llms.txt, not a page inside your site's normal navigation. On WordPress and most CMS platforms, that means uploading it to your site's root folder (usually public_html) via your host's File Manager or FTP, since the CMS's own page editor can't place a file at the root. Squarespace, Wix and Shopify generally don't allow this at all without a workaround specific to the platform.

Is it worth doing?

It's a small, low-risk addition: a few minutes of writing, no design work, nothing that can break your site. Whether it moves the needle on being recommended by an AI assistant depends on everything else about your site too, structured data (schema markup), your Google Business Profile, and basic technical health all factor in more heavily. Treat it as one piece of a larger picture, not a silver bullet.