Robots.txt Tester
Validate your robots.txt file and check if AI crawlers can access your content.
What This Tool Analyzes
AI Crawler Detection
Checks access permissions for major AI crawlers including GPTBot, PerplexityBot, CCBot, and more.
Robots.txt Parsing
Parses and validates your robots.txt file for syntax errors and misconfigurations.
Access Recommendations
Provides clear recommendations on which crawlers to allow or block based on your AI visibility goals.
How to Use This Tool
- 1Enter your domain URL - Paste your website URL to fetch and analyze its robots.txt file.
- 2Review crawler access - See which AI crawlers are allowed or blocked from accessing your content.
- 3Optimize access rules - Adjust your robots.txt to ensure important AI crawlers can access your content.
Frequently Asked Questions
Should I block AI crawlers in robots.txt?
Blocking AI crawlers prevents your content from appearing in AI search results. Unless you have specific reasons (copyright, bandwidth), it's generally better to allow AI crawlers to increase your AI visibility.
What is GPTBot?
GPTBot is OpenAI's web crawler used to train and improve ChatGPT. If blocked, your content won't be used in ChatGPT's training data or cited in its responses.
Does robots.txt affect all AI platforms?
Most AI platforms respect robots.txt, but not all do. This tool checks the major AI crawlers that are known to follow robots.txt directives.
Which AI crawlers should I specifically allow?
At minimum, allow GPTBot and ChatGPT-User (OpenAI), PerplexityBot, CCBot (Common Crawl), Bytespider (ByteDance/Doubao), and Baiduspider (Baidu AI). Also allow Googlebot and Bingbot, as Google AI Overview and Bing Copilot use their respective search indexes.
Can I allow AI crawlers but block them from specific pages?
Yes. Use path-specific Disallow rules in your robots.txt to block crawlers from specific directories or pages while allowing full access to your public content. This is the recommended approach for protecting private content while maintaining AI visibility.
What happens if I accidentally block an AI crawler?
Blocked AI crawlers cannot access your content at all, which means your pages will not appear in AI-generated responses. The effect persists until you fix the robots.txt rule and wait for the crawler's next visit. Use the tester to catch these errors early.
Why AI Crawler Access Is the Most Fundamental Citation Prerequisite
AI crawler access is the most basic prerequisite for citation — if your robots.txt blocks AI crawlers, no amount of content optimization will help. Blocked crawlers mean your content is invisible to AI training data and live web search, eliminating any possibility of being cited in AI-generated responses. This single configuration error can undo all your other GEO efforts.
Many websites inadvertently block AI crawlers through overly restrictive robots.txt rules, wildcard patterns that catch more bots than intended, or inherited CMS defaults that block unknown user agents. The Robots.txt Tester checks all major AI crawler user agents against your actual robots.txt file, revealing any access barriers that silently prevent citation.
Best Practices
Allow All AI Crawlers by Default
Configure your robots.txt to allow GPTBot, PerplexityBot, CCBot, Bytespider, and other known AI crawlers by default. Only block specific paths containing private or duplicate content — never block crawlers site-wide unless you have a specific reason.
Block Only Specific Paths
Rather than blocking entire user agents, use path-specific Disallow rules to protect sensitive areas like admin panels, search results pages, or duplicate content. This preserves AI access to your valuable content while keeping private pages hidden.
Test After Every robots.txt Change
Run the tester immediately after modifying your robots.txt to verify that AI crawlers still have access. Small syntax errors or overly broad patterns can unintentionally block crawlers, and the impact on citation won't be visible until the next re-indexing cycle.