llms.txt Generator

llms.txt Generator: Build an AI-Visibility File for Your Site, Free

If you've seen llms.txt mentioned next to robots.txt or a sitemap, the comparison is useful but imperfect. robots.txt has been part of the web for almost 30 years and every major crawler respects it. llms.txt is a 2024 proposal from Jeremy Howard of Answer.AI, documented at llmstxt.org, built on a simple idea: large language models have limited context windows and no reliable way to tell a clean documentation page from an ad-cluttered one, so give them a short, hand-written index instead of making them guess.

This tool builds that file for you: a llms.txt generator that turns your site name, summary, and a list of links into the exact Markdown structure the spec describes, plus the wider ecosystem's llms-full.txt variant for tools that want more than just links. Everything below is grounded in the actual spec text and in independent adoption research, not guesswork, because this is a newer and much less settled space than classic SEO practices like meta tags or sitemaps.

1What the llms.txt Spec Actually Requires

The format documented at llmstxt.org is deliberately small. Only one part is required: an H1 header with your site or project's name. Everything else is optional but recommended: a Markdown blockquote directly under the H1 with a short summary containing the key facts a reader needs, then zero or more plain paragraphs with further detail, and finally zero or more sections marked with H2 headers, each containing a Markdown link list in the form - [title](url): note. The spec calls out one naming convention by name: an "Optional" H2 section, used for secondary links an agent can skip when it needs a shorter file. This generator follows that structure exactly, including the "Optional" convention when you choose to use it.

2Is llms.txt an Official Standard? Being Straight About It

No. It's worth saying plainly: llms.txt has not been adopted by the IETF, the W3C, or any other standards body, and none of the major AI labs have published an official commitment to read it. What does exist is real, if mixed: documentation platforms, coding assistants, and a growing list of developer tools do fetch llms.txt or llms-full.txt when a project exposes one, and sites belonging to companies like Anthropic, Cloudflare, and Vercel publish one. But adoption research disagrees sharply on the numbers. One widely cited September 2026 study found llms.txt or llms-full.txt present on only about 9.3% of the top 1,000 domains and 8.3% of the top 10,000, checking strictly for a root-level file; other studies using looser methodology report figures several times higher, and a separate large-scale analysis of roughly 300,000 domains found no clear, consistent effect on whether a site actually gets cited in AI-generated answers. We'd rather tell you that directly than oversell a file format that is still being tested in practice.

3Simple vs Pro

Simple Mode covers the common case well: one site, one list of links, one correct file. Pro Mode, currently free to use, is built for sites with more structure, such as separating core docs from optional references, importing an existing sitemap's worth of links in one paste, or maintaining llms.txt files for several projects from saved profiles.

4Who Actually Publishes an llms.txt File Today

The clearest, best-supported use case today is documentation: a project that wants an AI coding assistant or agent to find its real docs quickly, instead of piecing together an answer from scattered, possibly outdated pages. Marketing or content sites publishing llms.txt mainly to chase broader AI search visibility are, honestly, ahead of the evidence; treat it as a low-cost experiment worth trying, not a dependable traffic channel yet.

5llms.txt vs llms-full.txt

llms.txt stays small on purpose: an index of links, not the content itself. llms-full.txt, by contrast, is meant to hold the actual material in one place, formatted as a continuous document rather than a link list. It isn't part of the original llms.txt spec text, but it has become a standard companion file across the ecosystem, including documentation platforms that publish both by default. This tool's Pro Mode generates an llms-full.txt from the same site, section, and link data you already entered, reformatted into one document; it does not fetch or scrape your actual pages, so review it before publishing to make sure your notes cover what each page contains.

6Frequently Asked Questions