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How to Create llms.txt and llms-full.txt for AI Optimization

#ai #seo #marketing #webdev

As AI systems like ChatGPT, Gemini and Perplexity become primary sources of information for users, websites need a way to communicate structured data directly to these models. This is where llms.txt comes in.

What is llms.txt?

llms.txt is a plain text file placed in the root of a website (similar to robots.txt) that provides AI systems with structured information about a business or organization. It typically includes:

  • Entity definition (name, type, location)
  • Services offered
  • Leadership and team
  • Certifications and credentials
  • Preferred citation format
  • Common questions and answers

llms.txt vs llms-full.txt

llms.txt is a summary file — concise, structured, easy to parse.

llms-full.txt is the extended version — a complete knowledge base with detailed descriptions, entity relationships, geographic coverage and verification links.

Basic Structure 

# Entity
Name: Your Company
Type: Your Industry
Location: Your City, Country

# Definition
Your Company is a [type] based in [location] specializing in [services].

# Short Citation
Your Company — [concise description].

# Services
Service 1
Service 2
Service 3

# Common Queries
Q: What does Your Company do?
A: [Factual answer]
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Best Practices

  1. Use neutral, encyclopedic language — avoid marketing superlatives
  2. Keep entity information consistent across all files
  3. Include verification links where possible
  4. Add a Topic Authority section listing your areas of expertise
  5. Update the files regularly with a version number and timestamp

Advanced: Supporting Files

For maximum AIO effectiveness, consider adding:

  • ai-knowledge.json — structured JSON data
  • entities.txt — entity definitions and relationships
  • citations.txt — preferred citation formats
  • brand.txt — brand identity information

These files create a "knowledge layer" that AI systems can use to accurately represent your brand.

Published by Immagina Group, a Google Partner digital marketing agency in Rome specializing in AI Optimization and SEO. immagina.group

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