Free llms.txt Validator & Generator
Check if your site has an llms.txt file - the new standard for AI crawler discoverability. Validate, fix, and generate your llms.txt for free.
Enter Domain
Type any domain to check its llms.txt file
Validate & Check
We verify format, check URL accessibility, and flag issues
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Frequently Asked Questions
What is llms.txt?
llms.txt is a proposed standard for telling AI crawlers and LLMs about your website's content. It lives at https://yourdomain.com/llms.txt and uses a simple markdown format with sections and URL lists. Think of it like robots.txt but for AI discoverability.
Why do I need an llms.txt file?
AI crawlers from OpenAI (GPTBot), Anthropic (Claude), Google (Gemini), and others are increasingly looking for llms.txt files to understand which pages to read and how to interpret your content. Without one, AI models may miss your best pages or misinterpret your site structure.
How does this validator work?
We fetch your llms.txt file (if it exists), parse the markdown sections and URL lists, check each referenced URL's accessibility, and flag any format issues. Then we provide actionable feedback and can generate an optimized version.
How do I create an llms.txt?
Use our free generator - enter your domain and we'll crawl your sitemap, group pages by category, and generate a properly formatted llms.txt file. Then upload it to your server at /llms.txt.
What format should my llms.txt use?
Use markdown headings (# Site Name for the title,## Section for categories) and bullet lists (- URL: Description). Each URL should have a brief description after a colon. All URLs must be absolute (starting with https://).