llms.txt Checker
Check whether your site publishes an /llms.txt file for AI models, and get a template to write one in 10 minutes.
Free: free single-URL checks, up to 10 per hour, no sign-up.
llms.txt is a plain-text Markdown file at /llms.txt that summarizes a website for large language models: what it is, who it is for, and which pages matter most. GEO Checker detects the file, confirms it returns HTTP 200, and reports it alongside your AI crawler and schema results.
How to write an llms.txt file in 5 steps
- Start with
# Your Brandas the only H1. - Add a one-paragraph summary as a blockquote (
> ...) with a definition sentence and 2–3 concrete facts (price, free tier, audience). - Add
## Core pageswith 3–10 Markdown links and a short description after each. - Optionally add
## Docs,## Pricingand## Optionalsections. - Upload it to the site root, then run the checker above to confirm HTTP 200.
llms.txt template
# Acme Shoes
> Acme Shoes is an online store for wool running shoes. Free shipping over $50, 30-day returns.
## Core pages
- [Men's running shoes](https://example.com/men/): full range, sizes 7–14
- [Pricing & shipping](https://example.com/shipping/): rates and delivery times
- [FAQ](https://example.com/faq/): returns, sizing, care
## Optional
- [Blog](https://example.com/blog/): guides and newsSee our own file as a live example: geocheckerai.com/llms.txt.
llms.txt vs robots.txt vs sitemap.xml
| File | Audience | Purpose |
|---|---|---|
| robots.txt | All crawlers | Allow or disallow crawling per user-agent (test AI bot rules) |
| sitemap.xml | Search engines | List every indexable URL with lastmod dates |
| llms.txt | Language models and AI agents | Short human-readable summary and the most important links |
FAQ
What is llms.txt?
llms.txt is a proposed standard (llmstxt.org, 2024): a Markdown file at the root of a site (/llms.txt) that gives language models a short summary of the site and links to its most important pages.
Do ChatGPT, Perplexity or Google use llms.txt?
As of October 2026 no major AI search engine has publicly confirmed using llms.txt for ranking or citations. It is cheap to publish and is read by some AI agents and developer tools, so treat it as low-cost insurance rather than a ranking factor.
What should llms.txt contain?
An H1 with the site or product name, a one-paragraph blockquote summary, then H2 sections with Markdown link lists to key pages, each with a short description. Keep facts such as prices and limits identical to your pages.
Where do I put llms.txt?
At the root of your domain, served as plain text with HTTP 200: https://example.com/llms.txt. It should not be blocked by robots.txt or your firewall.
Is the llms.txt checker free?
Yes: free single-URL checks, up to 10 per hour, no sign-up. The same scan also checks AI crawler access and structured data.