llms.txt Generator & Validator
Generate a spec-correct llms.txt from your sitemap - curated sections with LLM-written descriptions - or paste an existing file and validate it against the llmstxt.org spec, with link health checks and an A to F grade.
llms.txt is a proposed standard for giving LLMs a curated, markdown-friendly map of your site. This free tool does both halves of the job: generates a file that actually follows the spec, and validates the one you already have. And it is honest about where llms.txt genuinely helps - and where it is just hype. No account needed.
Generate
Point it at your sitemap and get a spec-correct llms.txt - pages curated into sections, each with an LLM-written description.
Validate
Paste an existing llms.txt and get it checked against the llmstxt.org spec, with link health verification and an A to F grade.
Download free
The finished file is yours to download at no cost - no paywall, no email gate, no account.
Generate llms.txt from your sitemap
Hand-writing an llms.txt means curating your pages, structuring them into sections and describing each link - tedious for anything bigger than a brochure site. The generator reads your sitemap, curates the pages into sensible sections, and writes a one-line description for each link using an LLM, so the output follows the llmstxt.org format rather than being a raw URL dump.
An llms.txt validator with link health and a grade
Plenty of llms.txt files in the wild are malformed - wrong structure, broken markdown, dead links. Paste yours (or enter your domain) and the validator checks it against the llmstxt.org spec, verifies that every linked page actually resolves, and hands back a grade from A to F with specific fixes. Useful whether you wrote the file by hand or generated it elsewhere.
llms.txt for your website - do you actually need one?
Honest answer: probably not yet, and this tool tells you so rather than overselling it. Major AI providers have not committed to reading llms.txt, so treating it as an AI-SEO silver bullet is hype. Where it genuinely earns its keep today is documentation sites: a curated llms.txt gives coding agents and AI assistants a clean map of your docs, which makes their answers about your product better. If that is you, it is worth five minutes.
Free to download - no paywall on the file
Some llms.txt generators let you preview the output and then charge, or gate the download behind an email signup. Here the finished file is simply yours: generate it, check the grade, download it and drop it at the root of your site. It is built by the team behind Chat Thing as a free tool for the same audience we serve - teams making their sites and docs work well with AI.
FAQ
Your questions, answered
What is llms.txt?
llms.txt is a proposed standard (llmstxt.org) for a markdown file at the root of your site that gives LLMs a curated map of your most important pages, with short descriptions. Think of it as a table of contents written for AI models rather than crawlers.
Is this llms.txt generator free?
Yes - generating, validating and downloading the file are all free, with no account or email gate. It is built by the team behind Chat Thing.
How does the generator work?
It reads your sitemap, curates the pages into sections, and uses an LLM to write a short description for each link. The output follows the llmstxt.org format, so you get a genuinely spec-correct file rather than a raw list of URLs.
What does the validator check?
It checks your file's structure against the llmstxt.org spec, verifies the health of every link in it, and grades the result from A to F with specific fixes for anything that fails.
Do AI models actually read llms.txt?
Adoption is unproven - major AI providers have not committed to it, and we say so in the tool rather than pretending otherwise. The clearest real-world value today is for documentation sites, where coding agents and AI assistants benefit from a curated map of your docs.
How is llms.txt different from robots.txt?
robots.txt tells crawlers what they may or may not fetch. llms.txt does the opposite job: it points AI models at your best content and describes it, so they can understand and use your site more effectively. They live side by side at your site root.
Where do I put the file once I have it?
Upload it to the root of your site so it is served at yourdomain.com/llms.txt. Then re-run the validator against your live domain to confirm everything resolves.
Keep going
More free tools and next steps
Agent Readiness Checker
llms.txt is one signal among many. Scan your whole site and see how ready it is for AI agents across access, citation and transaction.
Take a lookKnowledge Base Grader
If your docs are the reason you want llms.txt, grade them first - structure, coverage and whether an AI can actually answer from them.
Take a lookTrain a bot on your website
Do not wait for AI providers to find your content: Chat Thing turns your site and docs into an AI bot that answers questions today.
Take a lookWant an AI bot that answers from your own content?
Browse all free tools → Ready to start creating bots?
Create a free account today.
Create bots that solve all sorts of problems in minutes. Customer support bots, writing buddies, HR bots, API docs bots or what ever Chat Thing you can think of!