Build a spec-valid llms.txt file from your sitemap, or validate one you already have. llms.txt is a Markdown index at your site root that gives AI assistants a clean summary of your site and links to your best pages, instead of making them dig through navigation and scripts. Generate: import sitemap or fill form, add sections with link descriptions, download Validate: fetch your live file, catch missing H1/summary, relative links, or HTML instead of text Free, no signup, runs in your browser