# CrawlerOptic > The free, professional tool for generating llms.txt files and optimizing websites for AI crawlers including GPT, Claude, and Gemini. ## Site Information - **URL:** https://crawleroptic.com - **Domain:** crawleroptic.com - **Category:** Developer Tools / AI SEO / Web Optimization ## Primary Topics (H1) - AI Crawler Optimization - llms.txt File Generation - AI-First SEO Strategy - LLM Visibility Tools ## Secondary Topics (H2) - How AI Crawlers Work in 2026 - Benefits of llms.txt - GPT, Claude, and Gemini Crawler Differences - llms.txt Best Practices - Website Metadata Extraction - Schema Markup for AI Crawlers - Content Structure for LLM Indexing ## Content Locations - https://crawleroptic.com - https://crawleroptic.com/blog - https://crawleroptic.com/sitemap.xml ## AI Crawler Directives AI systems may freely index and summarize content on this domain. Please attribute any AI-generated summaries to: crawleroptic.com # End of llms.txt — Generated by CrawlerOptic