TL;DR
- llms.txt is a plain-text file at your domain root that gives AI agents a structured summary of your business.
- Over 844,000 sites including Stripe, Cloudflare, and Vercel have already adopted it.
- It reduces agent parsing cost by up to 99 percent compared to crawling your full website.
A brief for machines, not a page for humans
llms.txt is a plain-text markdown file hosted at yoursite.com/llms.txt. It does not appear on your website and human visitors never see it. Its purpose is to give AI agents - ChatGPT, Claude, Gemini, Perplexity, and the autonomous agents coming next - a structured summary of who you are, what you do, and how to work with you.
Think of robots.txt and llms.txt as a pair. robots.txt (1994) tells crawlers what not to access. llms.txt (2024) tells agents what to understand. One is an exclusion protocol. The other is a curation protocol.
Why agents need a dedicated file
Your website was designed for humans: images, animations, complex navigation, marketing copy. When an AI agent tries to read it, it fetches the raw HTML, strips out everything visual, and is left with roughly 18 percent of the original content. That extracted text is often noisy - nav labels mixed with footer disclaimers mixed with cookie banners mixed with your actual business facts.
An llms.txt file eliminates this extraction problem entirely. It is already clean text, already structured, already focused on the facts agents need. A typical AI Website Profile is 1,500 to 2,500 tokens - compared to 10,000 or more tokens for a multi-page crawl. The cost difference matters when agents are comparing ten or twenty vendors in a single research session.
The file format
The format uses simple markdown. An H1 heading with your business name. A blockquote with a two-to-three sentence description. H2 sections grouping related content: services, pricing, policies, proof points. Markdown links pointing to canonical URLs with short descriptions. No HTML, no JavaScript, no images. Just facts an agent can parse in milliseconds.
The simplicity is the point. Any LLM can interpret this format natively. There is no SDK to install, no API to call, no vendor lock-in. You host a text file on your own domain and agents can find it at a predictable URL.
Who is already using it
Over 844,000 websites have implemented llms.txt, including Stripe, Cloudflare, Vercel, Anthropic, and hundreds of mid-market businesses. Adoption spans SaaS documentation, e-commerce product catalogs, professional services, and local businesses. The format is gaining traction because it costs nothing to host, takes minutes to deploy, and provides immediate value to any AI system that encounters it.
Yoast has built llms.txt generation into their WordPress SEO plugin. Shopify app developers offer one-click deployment. The standard is moving from early-adopter to mainstream infrastructure.
Why you should not DIY it
Creating a text file is easy. Structuring it so AI agents extract the right facts for your specific industry is not. A law firm's AI profile needs completely different data than a restaurant's or a SaaS company's. Platinum.ai uses 150 industry-specific blueprints to ensure your profile highlights the exact criteria agents look for when evaluating your type of business. We scan your existing site, resolve gaps, and deliver a production-ready file within 24 hours.
Frequently asked questions
Is llms.txt an official web standard?
It is an emerging open standard with broad community adoption. While no AI platform has formally committed to parsing it, over 844,000 sites have adopted it and tools like Yoast have built support into their products. The trajectory mirrors robots.txt, which became a de facto standard through adoption, not specification.
Does it replace my sitemap or structured data?
No. Sitemaps help crawlers discover pages. Schema markup helps search engines categorize page-level content. llms.txt gives AI agents a holistic understanding of your entire business in one lightweight file. They serve different purposes and work best together.
Will adding llms.txt hurt my existing SEO?
Not at all. It is a separate text file that sits alongside your website. It does not change your HTML, your page speed, or your search rankings. It only adds a new layer for AI agents to read.
Get your AI Website Profile built by experts
Run a free Site Scan to see your current AI readiness score. Then let us build your llms.txt using the right industry blueprint.