llms.txt checker
Does your site have an llms.txt file? Check it for free and see whether AI assistants can read it.
What is llms.txt?
llms.txt is a plain Markdown file placed at the root of your website (yourdomain.com/llms.txt). It gives large language models a short, curated guide to your site: who you are and which pages matter most.
Think of it as a table of contents written for AI. robots.txt tells crawlers what they may fetch and sitemap.xml lists every URL, while llms.txt points to the few pages that best explain your business.
AI assistants such as ChatGPT, Claude, Perplexity and Gemini work with limited context. A clean, curated list of links helps them find and quote your most useful content instead of guessing from menus and cookie banners.
The format is simple: one H1 title, an optional short summary in a blockquote, then H2 sections containing lists of links, each with a short note.
No file can guarantee that an AI will cite you, but adopting the convention takes a few minutes and removes friction. This checker validates your file against the llmstxt.org proposal.
How to create your llms.txt
Create a text file named llms.txt and upload it to the root of your domain. A minimal example:
# Acme Plumbing
> Family-run plumbing company in Leeds: emergency repairs, boiler installs and maintenance plans.
## Services
- [Emergency repairs](https://acme.example/emergency): 24/7 call-outs across Leeds
- [Boiler installation](https://acme.example/boilers): Fixed-price quotes
## About
- [Our team](https://acme.example/about): Who we are and our certifications
- [Contact](https://acme.example/contact): Phone, email and opening hours
Replace the placeholders with your own pages, keep it to a few dozen links, and run the check again. Optionally publish an llms-full.txt with the full text of your key pages.
Frequently asked questions
Is llms.txt an official standard?
It is a community proposal published at llmstxt.org, not an official web standard. Support varies by AI provider, but adoption is growing.
Will llms.txt improve my rankings?
It does not change classic Google rankings. It helps AI assistants understand your site, which is the goal of GEO (Generative Engine Optimization).
What is llms-full.txt?
An optional companion file that holds the full Markdown content of your key pages in one place, so a model can read it without crawling every URL.
Is this checker really free?
Yes, no signup needed. We only fetch your public llms.txt, respecting robots.txt, and we do not store the address you enter.
llms.txt is just one signal
Run the full free GEO scan to see how AI-ready your whole site is: crawl, semantic graph and a GraphRank score from 0 to 100.
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