llms.txt Explained: Should Your Business Have One?
An llms.txt file is a plain text document placed at the root of your website that provides AI crawlers with a concise, structured summary of your business — what you do, what services you offer, and what content you've published. Think of it as a cover letter for AI engines: a quick, authoritative brief that helps them understand and represent your business correctly, which directly supports your business growth by ensuring AI recommendations are accurate.
What llms.txt Does
When an AI engine crawls your website, it reads hundreds or thousands of pages and tries to synthesize what your business does. Without guidance, it may emphasize the wrong services, miss key offerings, or mischaracterize your expertise. An llms.txt file gives the AI a structured summary to start from — reducing errors and increasing the likelihood that AI recommendations about your business are accurate and complete.
The format is simple: a plain text or markdown file at yourdomain.com/llms.txt containing your business name, description, service list, key content, and contact information. There's no complex markup required — just clear, structured text.
What to Include in Your llms.txt
A good llms.txt file contains five sections: a one-paragraph business description, a list of all services you offer, your key differentiators, links to your most important content (cornerstone blog posts, key service pages), and contact information. Keep it concise — 500-1000 words is ideal. AI engines process this file quickly and use it as an anchor for understanding everything else on your site.
Does It Actually Work?
Based on our testing across client implementations, businesses with llms.txt files see a measurable improvement in the accuracy of AI-generated descriptions about them. Before implementing llms.txt, AI engines often described these businesses with vague or partially incorrect information. After implementation, the descriptions aligned much more closely with the actual service offerings and positioning.
The impact on recommendation frequency is harder to isolate from other AEO improvements, but the accuracy improvement alone justifies the minimal effort required to create the file.
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Creating an llms.txt file takes about 30 minutes. Start with a one-sentence description of your business, then list your services with brief descriptions, add links to your 5-10 most important pages, and include contact information. Save it as a plain text file and upload it to your website root. Update it quarterly as your services or content evolve.
Frequently Asked Questions
Is llms.txt an official standard?
It's an emerging convention, not a formal standard. However, major AI engines including ChatGPT and Perplexity are known to read and process llms.txt files when they exist. Creating one aligns your business with best practices for AI discoverability.
Will llms.txt replace robots.txt?
No. They serve different purposes. robots.txt tells crawlers which pages they can access. llms.txt tells AI engines how to understand your business. Both should be present on any business website optimized for AI visibility and business growth.
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