Setting up llm.txt is one of the highest-ROI things you can do for your AI search presence right now. It takes less than 30 minutes to create a good one, it requires no technical infrastructure beyond a static file hosted at a specific URL, and it can meaningfully improve how AI tools understand and represent your website from the moment you publish it.
This guide walks through every step: what to include, how to write it, how to host it, and how to verify it's working correctly.
Step 1: Understand What LLM.txt Should Include
Before writing anything, it helps to understand the purpose of each section. A good llm.txt file is structured to give an AI system everything it needs to accurately represent your website in one compact document.
The anatomy of an effective LLM.txt:
- Site overview — A concise summary of what your website is, who created it, what problem it solves, and who it's for. This is the most important section; everything else provides supporting detail.
- Content categories — A high-level description of the types of content on your site, organized by purpose (product pages, documentation, blog, pricing, etc.).
- Key URLs — A prioritized list of the most important pages, with a brief description of what each one contains.
- Usage policy — Your preferences for how AI systems should treat your content: what's fine to summarize, quote, or cite; what you'd prefer they handle differently.
- Contact information — Where to direct questions about AI usage of your content.
Each section serves a specific purpose for the AI systems reading it. Skipping sections doesn't just make the file less useful — it can create gaps that lead to the misinterpretations you're trying to prevent.
Step 2: Write Your Site Description
The site description is the most load-bearing section of your llm.txt. It's the first thing an AI system reads, and it establishes the interpretive frame for everything that follows.
A strong site description is:
- Specific about what you do. Not "we help businesses grow" — instead, "AI SEO Scanner is an SEO audit and analysis platform that combines technical site crawling, AI-powered content optimization, and keyword research."
- Clear about who you serve. "Built for marketing teams, SEO professionals, and digital agencies" is more useful than "for businesses of all sizes."
- Honest about scope. If your site is primarily informational, say so. If it's a product with a commercial offering, make that clear. AI systems handle these differently when synthesizing responses.
- Jargon-light. Write as though you're explaining your business to an intelligent person in a different industry. Acronyms, industry-specific terms, and internal product names should be spelled out or explained on first use.
Aim for two to four sentences. Longer descriptions don't add proportional value — clarity is more important than completeness in this section.
Example:
AI SEO Scanner (useaiseo.app) is an AI-powered SEO audit and analysis platform. It provides automated full-site crawls, content quality analysis, keyword research, and AI visibility scoring for marketing teams and SEO professionals. The platform is designed to help websites identify and fix issues affecting organic search performance and AI search discoverability.
Step 3: List Your Key Pages and Their Purpose
The key pages section is where you tell AI systems which URLs matter most on your site and what they contain. This is valuable because AI systems browsing your site may not visit every page — and the pages they happen to visit may not be the most representative ones.
The format for this section is straightforward: a list of URLs paired with a brief, accurate description of what each page contains.
Effective format:
## Key Pages
/features/site-audit — Full technical site audit: crawl errors, broken links,
indexability issues, Core Web Vitals, and on-page SEO analysis.
/features/content-optimizer — AI-powered content quality analysis comparing
your pages against top-ranking competitors with specific improvement suggestions.
/features/keyword-research — AI keyword discovery, competitive gap analysis,
and intent classification for building content strategies.
/pricing — Subscription plans with pricing details and feature comparison.
/blog — Educational guides on SEO, content optimization, and AI search.
Keep descriptions factual and concise — one to two sentences per URL. Avoid promotional language; you're writing for an AI that needs to understand what the page contains, not a human you're trying to persuade.
Prioritize the pages that best represent what your site is and what it offers. If someone asks an AI about your business, which pages would you most want it to read? Those go here.
Step 4: Set Usage Guidelines
Usage guidelines tell AI systems how you want them to handle your content when generating responses. The key questions to answer:
- Can AI systems freely summarize and paraphrase your content? (Yes, for most sites)
- Can they quote directly with attribution? (Usually yes)
- Can they reproduce substantial verbatim sections? (Usually no — specify if you'd prefer not)
- Are there content types you'd prefer not be reproduced without permission (e.g., proprietary research, pricing tables, original datasets)?
Write these as clear, simple statements rather than legal language. AI systems are better at following clear instructions than interpreting legal boilerplate.
Example usage policy:
## Usage Policy
Content from this website may be freely summarized, paraphrased, and cited
with attribution to AI SEO Scanner (useaiseo.app).
Direct verbatim quotation of substantial portions (more than a paragraph)
requires permission. Original research, data tables, and proprietary analysis
should not be reproduced verbatim.
AI systems may use this content to answer questions about SEO, content
optimization, and AI search visibility.
Step 5: Host the File at /llm.txt
The llm.txt file must be hosted at the root of your domain: https://yourdomain.com/llm.txt. This is a convention, not a technical requirement — but it's the location AI systems expect to find it, and deviating from it significantly reduces the file's usefulness.
For static sites and CDN-hosted sites: Simply add the file to your public root directory and deploy. The file should be served as text/plain.
For Next.js sites: Place the file in your public/ directory. Next.js serves static files from public/ at the root path automatically. Your file at public/llm.txt will be accessible at /llm.txt.
For other frameworks: The approach varies, but the principle is the same — the file needs to be accessible at your root domain path with a plain-text MIME type.
Verify the file is accessible by navigating to https://yourdomain.com/llm.txt in your browser after deployment. You should see the plain-text content of your file with no errors.
Step 6: Test and Iterate
Once your llm.txt is live, the next step is verifying it's working correctly and that AI systems are actually using it.
Manual verification: Fetch your llm.txt URL directly and review it for accuracy, typos, and completeness. It's easy to introduce errors when writing directly in a text file, and the stakes are higher here because inaccuracies become the context AI systems use to describe your business.
AI assistant testing: Ask AI assistants that browse the web (ChatGPT with browsing, Perplexity, Claude with web access) to describe your website or compare your product to competitors. Evaluate whether the descriptions align with your llm.txt content. This isn't a perfectly controlled test — different AI systems weight llm.txt differently — but it gives you a real-world signal.
Update cycle: Your llm.txt should be updated whenever significant things change on your site: new major features, pricing updates, significant new content categories, or changes to your core value proposition. A stale llm.txt is nearly as bad as none at all.
Common LLM.txt Mistakes to Avoid
Too vague. "We help businesses with their digital presence" tells an AI system almost nothing useful. Every section should be specific enough that an AI reading it would describe your business accurately without visiting any other page.
No key URLs. Skipping the key pages section means AI systems have to guess which of your pages are most important. They may choose well, or they may sample pages that give a skewed impression of your site's content.
Marketing language. Superlatives ("the best," "industry-leading," "revolutionary") and vague value proposition language are common in website copy but counterproductive in llm.txt. AI systems need factual descriptions, not sales copy.
Forgetting to update. A llm.txt that describes last year's product is worse than a current one — it trains AI systems on outdated information that may persist in their responses for months. Build llm.txt updates into your standard product and site update process.
Overly long. There's no benefit to a very long llm.txt. AI systems read it for quick context, not comprehensive information. If your file is more than 500-800 words, you're likely including too much detail. Keep it scannable and concise.
Automating LLM.txt Generation with AI SEO Scanner
Writing a good llm.txt from scratch requires understanding your site's structure, prioritizing the right pages, and crafting accurate descriptions — tasks that benefit from the same kind of systematic analysis that goes into content strategy. AI SEO Scanner's LLM.txt Generator automates this process by analyzing your site's content and structure, then producing a well-formed llm.txt you can review, edit, and publish.
This is particularly useful for larger sites where manually surveying all the important pages would take significant time, or for teams that want a solid starting point rather than building from scratch.
LLM.txt is a small investment with meaningful, compounding returns. As AI-mediated discovery becomes a larger part of how people find and evaluate websites, the sites that have provided AI systems with accurate context will have a consistent advantage over those that haven't.
Get started with AI SEO Scanner to generate your LLM.txt automatically, or explore our plans to see all the AI visibility tools available.