llms.txt file: the complete guide to making your website visible to AI in 2026
Cyril Cretin
Founder RadarLLM.ai
The llms.txt file is becoming the new standard for communicating with artificial intelligences. Like robots.txt did for search engines, llms.txt tells AIs who you are, what you do, and which pages matter.
What is the llms.txt file?
The llms.txt file is a text file placed at your website's root (example: your-site.com/llms.txt). It describes your site to language models (LLMs) like ChatGPT, Gemini, Perplexity and Claude. It's a strong Generative Engine Optimization (GEO) signal that helps AIs understand your business and cite you correctly in their responses.
Why is llms.txt important in 2026?
In 2026, over 2.5 billion queries per day are processed by AIs. Traffic from LLMs shows a 14.2% conversion rate, compared to just 2.8% for Google Search. Without an llms.txt file, AIs have to guess what your site does. With a well-written llms.txt, you control the message.
How to create an llms.txt file?
Create a text file named llms.txt at your domain root. Here's the recommended structure:
# votre-site.com — llms.txt > Description courte de votre activité en 1-2 phrases. ## Pages principales - [Accueil](https://votre-site.com) - [À propos](https://votre-site.com/about) - [Services](https://votre-site.com/services) - [Contact](https://votre-site.com/contact) ## Ce que nous faisons Description détaillée de vos services, expertise, et valeur ajoutée pour vos clients. ## Contact - Website: https://votre-site.com - Email: contact@votre-site.com
What's the difference between llms.txt and robots.txt?
robots.txt tells bots WHAT THEY CAN CRAWL. llms.txt tells AIs WHO YOU ARE. robots.txt controls technical access, llms.txt provides semantic context. Both are complementary and essential in 2026.
Is llms.txt recognized by ChatGPT and Gemini?
llms.txt is an emerging standard. Its adoption is growing rapidly but no major AI engine considers it an official ranking factor yet. However, AIs that crawl your site do read this file and use it to better understand your content. It's a low-effort, high-potential investment.
How to optimize your llms.txt for maximum impact?
Be factual and precise — AIs prefer clear descriptions over marketing copy.
List your most important pages first.
Include your industry, geographic area and specialties.
Update the file regularly when your content changes.
Add verifiable contact information (email, address, registration number).
Complement with a robots.txt allowing all AI bots (GPTBot, ClaudeBot, PerplexityBot).
RadarLLM generates your llms.txt automatically
During each audit, RadarLLM analyzes your site and generates a custom llms.txt file, adapted to your industry and main pages. This file is included in the fix files ZIP, ready to be uploaded to your domain root.
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