llms.txt is a plain-text file placed at the root of your website (yourdomain.com/llms.txt) that gives AI engines a clear, structured summary of your business — who you are, what you do, where you serve, and how you want to be described. Think of it as a business card written specifically for AI.

Where does the llms.txt file go?

In the root of your website, served at yourdomain.com/llms.txt, the same way robots.txt is served. AI crawlers look for it there.

Is llms.txt the same as robots.txt or schema markup?

No. robots.txt controls which crawlers are allowed in. Schema markup labels structured data for search engines. llms.txt is a human-readable summary written for AI/answer engines. They work together — Signal Flair deploys all three.

Resource · AI Visibility

What is llms.txt — and why AI misreads most businesses without it

Fewer than 1% of local businesses have this file. Here's what it is, why it matters, and how to fix it — in plain English.

The problem

AI engines — ChatGPT, Claude, Perplexity, Gemini, and Google AI — are now actively crawling websites to understand and recommend local businesses. The problem? Most sites give them almost nothing useful to work with.

llms.txt is a simple, standardized file that tells AI systems exactly who you are, what you do, where you serve, and how you want to be described. Without it, AI often draws a blank — or makes something up.

What llms.txt actually does

Gives AI a clear, structured summary of your business
Reduces hallucination and incorrect information
Improves how accurately AI describes your services and location
Becomes a strong signal for AI recommendations

Think of it as a business card written specifically for AI.

Before vs. after

Before · no llms.txt

“A local company in Indianapolis, Indiana that does something with… [vague description].”

After · proper llms.txt

“A family-owned HVAC company serving Indianapolis, Indiana and surrounding areas since 2012, specializing in repair and installation — consistently rated 4.9 stars.”

How to create one

1Create a plain-text file named llms.txt.

2Put it in the root of your site, served at yourdomain.com/llms.txt.

3Write a clear, accurate summary of your business — name, services, service area, and how you want to be described.

4Update it whenever your business changes.

That's the basic idea. Doing it well — so AI engines actually trust and cite it — is where the precision matters. (Signal Flair builds and deploys this for clients.)

How it compares to robots.txt & schema

robots.txt — controls which crawlers are allowed in.
Schema markup — labels structured data for search engines.
llms.txt — a human-readable summary written for AI / answer engines.

They're not interchangeable — they work together. A complete AI-visibility foundation deploys all three.

Why most businesses still don't have one

They don't know it exists
They assume traditional SEO is enough
They assume AI will “just figure it out”
Building it properly takes time and precision

Which is exactly why Signal Flair exists.

AI can find your business. But does it understand it?

Run your free Signal Pulse™. We'll scan 3 critical signals across ChatGPT, Claude, Perplexity, Gemini, and Google AI — and show you exactly where your business breaks, including whether you have an llms.txt file working for you.

▸ Run My Signal