What Is an llms.txt File and How Do You Create One for Your Website?
AI assistants and AI search tools now read websites on behalf of millions of people, but web pages are messy: menus, adverts, scripts and pop-ups bury the actual content. The llms.txt file is a proposed fix, a tiny plain-text map of your site written for machines. This guide explains what it is, what goes inside it, and how to create one in minutes using our free llms.txt Generator.
What is an llms.txt file?
An llms.txt file is a small markdown text file placed at the root of your website, at yourdomain.com/llms.txt, which summarises what your site is and lists its most important pages with a line of context for each. It was proposed in September 2024 by Jeremy Howard as a standard way to help large language models use websites accurately.
Think of it as a note pinned to your front door for AI visitors. A search crawler is happy to index everything you publish, but an AI assistant answering a question needs the short version: who you are, what you offer, and which pages are worth reading. Llms.txt gives it exactly that, in a format any model can read in one pass.
What does an llms.txt file look like?
It opens with the site name as the only level-one heading, followed by a one or two sentence summary in a blockquote, then grouped sections of links in markdown format, each link optionally followed by a short note explaining what the page is for. A final section named Optional can hold secondary links that tools may skip.
The whole file is plain markdown, so a human can read it as easily as a machine. Most good files are short: a name, a summary, and 10 to 40 curated links grouped under headings like Docs, Guides, Tools or Products. If your file starts to look like a list of everything you have ever published, it has stopped doing its job.
How is llms.txt different from robots.txt and a sitemap?
Robots.txt tells crawlers what they may access, a sitemap lists every URL for search engines, and llms.txt curates the important pages with explanations for AI tools. They live side by side in your site’s root, they do not replace each other, and each one speaks to a different audience with a different job.
The key word is curation. A sitemap is deliberately exhaustive; an llms.txt is deliberately selective. When an AI tool has limited room to read, which is most of the time, a selective human-written shortlist is far more useful than an alphabetical dump of two hundred URLs with no context at all.
Does your website actually need one?
Strictly, no: no major AI provider requires llms.txt, and Google has said it is not a search ranking factor. But it costs about ten minutes to create, it carries no risk, and AI crawlers, assistants and agent tools are steadily adopting the convention, so having one makes your site easier for them to describe correctly.
The honest way to frame it is as cheap insurance. If AI tools use it, you have handed them an accurate, flattering summary of your site instead of leaving them to guess from your messiest pages. If they ignore it, you have lost ten minutes. What it will not do is rescue weak content or replace real SEO.
How do you create an llms.txt file?
Write your site name and a one-line summary, group your best pages under a few headings with a short note for each, save the result as a plain text file named llms.txt, and upload it to your site’s root so it loads at yourdomain.com/llms.txt. Then open that URL in a browser to confirm it displays as plain text.
Doing it by hand is error-prone, mainly in the markdown formatting, so most people use a generator. Our llms.txt Generator builds the file live as you type, checks the format for you, and offers copy and download buttons. Whichever route you take, choose pages you would proudly hand to a stranger as the best of your site.
What are the common mistakes to avoid?
The biggest mistake is listing everything: an llms.txt with 300 links is a sitemap with extra steps, and tools will ignore most of it. Other frequent errors are writing marketing fluff instead of a plain summary, forgetting the notes that explain each link, letting URLs rot after a site redesign, and uploading the file as an HTML page instead of plain text.
Also avoid copying a competitor’s file structure without thinking. Your shortlist should reflect your site’s actual strengths and the questions your visitors ask. Review the file every few months, prune what has dated, and add new flagship pages as you publish them.
Frequently asked questions
Who created the llms.txt standard?
It was proposed by Jeremy Howard, co-founder of Answer.AI, in September 2024, and has since been adopted voluntarily by thousands of sites, documentation platforms and developer tools, with community directories tracking implementations.
Where exactly do I upload llms.txt?
To the root folder of your domain, alongside robots.txt, so the file answers at yourdomain.com/llms.txt. On WordPress that usually means your hosting file manager, an FTP client, or a plugin that serves the file virtually.
Is there a bigger version called llms-full.txt?
Yes. Some sites also publish llms-full.txt, a single file containing the full text of their key pages, for tools that want everything in one fetch. It suits documentation sites best; most small sites only need the standard llms.txt.
Can llms.txt hurt my SEO?
No. It is a passive text file that search engines can simply ignore, and it does not change how any of your pages rank. The only way to waste it is to stuff it with keyword spam instead of an honest summary.
llms.txt is a voluntary proposed convention, not an official web standard, and no AI provider guarantees to use it; this guide describes the format as proposed by its creator.
