llms.txt is a plain text file placed at your domain root that tells large language models who you are, what you do, and what your most important content is — reducing AI inference uncertainty and increasing citation confidence. It’s the 2024 equivalent of robots.txt for a new kind of reader. Here’s everything you need to know to create one.
In 1994, robots.txt became the standard way websites communicated with search engine crawlers. In 2024, a new file emerged with a similar purpose for a new kind of reader: llms.txt. If robots.txt tells search crawlers how to crawl your site, llms.txt tells large language models how to understand it.
What llms.txt Is
llms.txt is a plain text file placed at the root of your domain (yoursite.com/llms.txt) that provides AI systems with a structured, curated summary of your site — who you are, what you do, what your most important content is, and how you want AI systems to represent you.
Unlike your full website — which is complex, multi-layered, and requires significant AI processing to understand holistically — llms.txt is a clean, direct signal. Think of it as the brief you’d give a new employee on their first day: here’s who we are, here’s what we do, here’s what matters most.
The format was proposed by Jeremy Howard and has been adopted by a growing list of high-profile sites including Anthropic, Cloudflare, and major SaaS companies. It’s not enforced by any standard body, but the major LLMs are increasingly reading it — and the adoption rate among AI-visible brands is accelerating.
Why It Matters for AI Visibility
AI systems that crawl the web to update their knowledge — as Perplexity and others do in real time — benefit from a clear, authoritative source of truth about your site. Without llms.txt, an AI system has to infer who you are from your full site content, your About page, your meta descriptions, and whatever third-party sources mention you.
With llms.txt, you’re doing the interpretation work for them. You’re saying: here’s exactly what we do, here are our most important pages, here are the key facts about our brand. That signal reduces inference uncertainty — and reduced uncertainty means higher citation confidence.
What Goes in llms.txt
A good llms.txt includes five core elements:
- Organization description. Who you are, what you do, who you serve. Two to four sentences maximum. Write it the way you’d describe yourself to a stranger in an elevator.
- Core service or product list. Plain language, no jargon. This is what AI systems use to categorize you when someone asks about solutions in your space.
- Links to your most important pages. Your pillar content, service pages, and About page. These are the pages you most want AI systems to have accurate knowledge of.
- Key differentiators. The things that make you specifically worth citing rather than a generic source. Named frameworks, proprietary methodologies, unique credentials.
- Factual claims for AI association. Specific data points, credentials, named frameworks you want AI systems to surface when asked about you. These become the citable facts AI systems pull when asked about your brand.
How to Create llms.txt for Your WordPress Site
Creating llms.txt requires nothing more than a text editor and FTP access (or your hosting file manager):
- Open a plain text editor — Notepad, TextEdit, VS Code. Not Word — that adds hidden formatting.
- Write your content following the five-element structure above. Keep the total file under 2,000 words. Concise is better.
- Save the file as llms.txt with no special characters in the filename.
- Upload it to the root of your domain via your hosting file manager or FTP. It should be accessible at yourdomain.com/llms.txt.
- Verify it works by visiting that URL in your browser. You should see plain text, not a formatted page.
That’s it. No plugin needed. No coding required. One file, 30 minutes, and your site is speaking directly to AI systems in the language they prefer.
If you want to go further, there’s also an llms-full.txt convention emerging for sites that want to provide more detailed content for AI context — essentially a more comprehensive version for systems that can process longer inputs. But start with the standard llms.txt first.
Frequently Asked Questions
What is llms.txt?
llms.txt is a plain text file placed at the root of your domain that tells large language models (LLMs) who you are, what you do, and what your most important content is. It was proposed by Jeremy Howard and is modeled after robots.txt, which serves a similar communication function for traditional search crawlers.
Do all AI systems read llms.txt?
Not all — it’s not an enforced standard. But adoption among major AI platforms is growing, and the cost of creating one is negligible (about 30 minutes). The upside is cleaner brand representation across every AI system that does read it. There’s no downside to having one.
Is llms.txt the same as robots.txt?
No — robots.txt tells search crawlers which pages to crawl or not crawl. llms.txt tells AI language models how to understand and represent your brand. They serve different audiences with different instructions. Most sites need both: robots.txt for search crawlers, llms.txt for AI systems.
How long should llms.txt be?
Keep it under 2,000 words. The goal is clarity and concision — you’re writing a brief for AI systems, not a comprehensive site map. The most effective llms.txt files are direct, factual, and easy to parse. Include what matters most; leave out everything else.
llms.txt is one of the simplest, highest-leverage AEO improvements you can make — and most sites haven’t done it yet. If you want to make sure your full AI visibility setup is optimized (llms.txt, schema, content structure, entity data), the KeywordGuys AEO audit covers all of it in a single engagement.