Free AI SEO & GEO Validator
Check your AI SEO and GEO (Generative Engine Optimization) readiness. Validate your llms.txt file and see if ChatGPT, Claude, and Perplexity can understand your website.
What is llms.txt?
llms.txt is a simple markdown file you add to your website root. It tells AI systems what your site is about and which pages matter most -- like a robots.txt, but for AI assistants such as ChatGPT, Claude, and Perplexity. Learn more
What Our AI SEO & GEO Validator Checks
We analyze the key factors that determine your Generative Engine Optimization (GEO) and LLM SEO readiness.
llms.txt File
The most important file for AI assistants. We check if it exists and validates against the spec.
Sitemap
A sitemap.xml helps AI crawlers discover all your important pages efficiently.
robots.txt
We check for AI crawler directives like GPTBot, ClaudeBot, and Google-Extended.
Meta Tags
Title, description, and Open Graph tags help AI understand your content context.
Structured Data
Schema.org JSON-LD markup gives AI systems explicit context about your content.
Need to check multiple websites?
Audit up to 50 sites at once and export agency reports.
See who has adopted llms.txt
Browse 840+ real examples from companies like Anthropic, Hugging Face, and more.
Explore the examples directoryFrequently Asked Questions
An llms.txt validator checks if your website's llms.txt file is correctly formatted according to the specification. It verifies the file structure, markdown formatting, and ensures AI systems like ChatGPT, Claude, and Perplexity can properly parse your content.
Simply enter your website URL in our free validator tool above. We'll automatically locate your llms.txt file, validate its format against the official spec, and provide a detailed report highlighting any issues found along with recommendations to fix them.
Our AI SEO checker tests five key areas that determine your AI search visibility: (1) llms.txt file presence and validity, (2) sitemap.xml accessibility, (3) robots.txt configuration for AI crawlers like GPTBot and ClaudeBot, (4) meta tags quality, and (5) structured data (Schema.org) implementation.
Yes! Our llms.txt validator and AI SEO checker is 100% free to use. No signup required, unlimited checks, and instant results. We believe everyone should be able to check their AI readiness without barriers.
GEO (Generative Engine Optimization) is the practice of optimizing your website to be discovered and cited by AI systems like ChatGPT, Claude, and Perplexity. It's also called AI SEO or LLM SEO. Our validator checks the key factors that influence your GEO score, including your llms.txt file, structured data, and AI crawler accessibility.
robots.txt tells crawlers which pages to access or avoid. llms.txt goes further - it provides AI systems with a structured overview of your website's content, helping them understand what your site is about and which pages are most important. Think of robots.txt as access control and llms.txt as a content guide for AI.