Build a valid robots.txt file that tells search engine crawlers which parts of your site they may and may not visit. Choose whether to allow all bots or block them all, add specific paths to disallow such as an admin area or a search results page, set an optional crawl delay, and include your sitemap URL so crawlers can find your pages efficiently. The tool assembles the directives in the correct format and order, which matters because a misplaced rule can accidentally hide your whole site from search or leave private paths crawlable. Copy the output into a file named robots.txt at the root of your domain. Everything is generated in your browser, so your site structure and rules are never sent to any server.