🤖Robots.txt Tester & Crawler Simulator Documentation & Guide
Social & SEO
The Robots.txt Tester evaluates website URL paths against robots.txt directives using standard RFC 9309 longest-match precedence rules across major search crawlers (Googlebot, Bingbot) and AI bots (GPTBot, ClaudeBot, PerplexityBot).
📋How to Use This Tool
- Paste robots.txt Directives: Enter your existing or planned robots.txt rules into the editor, or choose from pre-configured SEO and AI crawler presets.
- Select Target Crawler User-Agent: Choose which search engine bot or AI crawler you want to test (e.g., Googlebot, Bingbot, GPTBot, ClaudeBot, or wildcard *).
- Enter Test Paths: Input specific URL paths (e.g., /admin/, /api/v1/users, /blog/post-1) to evaluate whether crawler access is permitted or blocked.
- Inspect Verdict & Matching Rule: Review the color-coded Allowed or Blocked status along with the exact directive line that triggered the decision.
⚙️Technical Specifications & RFC 9309 Parsing Engine
Robots.txt parsing follows strict IETF RFC 9309 standards. When both Allow and Disallow rules match a path, the most specific (longest string) rule takes precedence.
• RFC 9309 Compliance: Follows longest-match rule priority for conflicting Allow and Disallow directives.
• Wildcard Matching: Supports * (zero or more characters) and $ (end of URL pattern) operators.
• Multi-Crawler Simulation: Evaluates specific User-Agent blocks first, falling back to wildcard User-Agent: * when bot-specific blocks are absent.
• Crawl-Delay & Sitemap Detection: Extracts and validates Crawl-delay and Sitemap declarations.
• Client-Side Sandbox: Evaluates rules locally in real time without querying production web hosts.
Testing crawler access before updating server robots.txt files prevents accidental de-indexing of critical site sections and governs AI bot indexing policies.
💡Practical Crawler Governance Use Cases
- Verifying that staging directories, administrative portals, and private APIs are effectively blocked from search bots.
- Confirming that disallow rules targeting AI scrapers (like GPTBot) do not inadvertently block organic Googlebot discovery.
- Debugging complex pattern-matching rules with wildcards ($ and *) before deploying them to production servers.
100% Client-Side Privacy Guarantee:All calculations, text manipulation, cryptographic hashing, and media conversions execute exclusively within your local browser sandbox. Zero user inputs, financial amounts, credentials, or proprietary files are ever transmitted across networks or logged on external servers.
