LLMs.txt: The New Standard for AI Crawler Communication

LLMs.txt is an emerging web standard that works like robots.txt but for AI crawlers. While robots.txt tells search engines what to crawl, LLMs.txt tells AI models what your brand is, what it does, and how to describe it accurately.

What LLMs.txt Does

An LLMs.txt file sits at the root of your domain (example.com/llms.txt) and provides structured information that AI models can use when generating responses about your brand. It includes:

• Brand identity — Official name, description, and positioning.
• Key facts — Pricing, features, founding date, team size.
• Preferred citations — How you want to be described and quoted.
• Corrections — Common misconceptions and the truth.

How to Create Your LLMs.txt

LLMs.txt uses a simple markdown-like format:

Basic Structure

• Title line: # Your Brand Name
• Description: > One-line description of what your brand does
• Sections: Organized with ## headings for Key Facts, Products, Pricing, Contact
• Links: References to key pages for more information

Best Practices

1. Keep it concise — Under 500 words. AI models process shorter, structured content more reliably.
2. Use specific claims — "Serves 10,000+ users" not "serves many users."
3. Include pricing — Reduces the #1 hallucination category.
4. List your differentiators — What makes you different from competitors.
5. Add a corrections section — Proactively address known hallucinations.

Why Early Adoption Matters

LLMs.txt is still emerging — most brands do not have one. Early adopters get a structural advantage: AI crawlers that support the standard will prefer your self-declared information over scraped and potentially outdated content.

Major AI companies including Anthropic, Perplexity, and several others have acknowledged or started supporting the standard. Adoption is growing rapidly.

Frequently Asked Questions

Do all AI platforms support LLMs.txt?

Not yet. Support is growing but not universal. However, having an LLMs.txt file does not hurt — and it provides a structured document that AI crawlers can still parse even without native support.

How is LLMs.txt different from schema markup?

Schema markup is embedded in your HTML for search engines and AI to parse. LLMs.txt is a standalone file specifically for AI models. They are complementary — use both.

Does 99Visibility have an LLMs.txt?

Yes. Visit 99visibility.com/llms.txt to see our implementation.

Check your AI visibility and see if AI platforms are describing your brand accurately — with or without LLMs.txt.