AVAILABLE FOR WEB, FLUTTER & QA PROJECTS
How to use this tool
1. Paste or Select Robots.txt Rules
Edit your robots.txt file in the code editor or choose from pre-built templates (Next.js, WordPress, Block All Staging, Standard Production).
2. Specify Test URL & User-Agent
Enter the relative path (e.g. /admin, /api/auth, /blog/my-post) and pick your target crawler (Googlebot, GPTBot, Bingbot, or *).
3. Run Immediate Match Evaluation
The engine parses rules in strict top-to-bottom priority order according to pattern length matching standards.
4. Review Verdict & Triggered Line
Inspect the exact line and directive responsible for the ALLOWED or BLOCKED result, along with syntax error alerts.
Formula or logic used
RFC 9309 Standard Matching Rules
The Robots Exclusion Standard evaluates path specificity, where the longest matching prefix between Allow and Disallow wins. Wildcards (*) match zero or more characters, while end-of-path ($) matches the exact trailing boundary.
Rule Specificity: If both Allow and Disallow match a path, the directive with the most characters in the pattern takes precedence.Equal Length Tie-Breaker: If Allow and Disallow have identical character length, the Allow directive wins.Wildcard (*): Matches any character sequence (e.g. Disallow: /*.pdf blocks all PDF files).End-of-String ($): Designates the strict conclusion of a URL (e.g. Disallow: /private$ blocks /private but allows /private/page).Case Sensitivity: Path rules are strictly case-sensitive (/Admin/ is distinct from /admin/).
Examples
Example 1: Next.js App Router API & Admin Guard
More specific Allow directives enable public asset rendering while protecting private API endpoints.
Example 2: AI Crawler Scraping Block
Blocks OpenAI training scrapers from crawling website content while leaving search engines unhindered.
Common use cases
Staging Site Leak Prevention
Verify that staging and preview environments have strict `Disallow: /` directives to prevent indexing duplicates.
AI Bot Traffic Management
Control whether generative AI agents (GPTBot, ClaudeBot, PerplexityBot) can scrape your intellectual property.
Crawl Budget Optimization
Block search bots from wasting crawl budget on faceted search filters, infinite pagination, or shopping carts.
Sitemap Discovery Verification
Confirm that your XML sitemap URL is clearly declared at the base of the file.
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Frequently asked questions
Does robots.txt remove a page from Google search results?
No. Robots.txt only prevents Googlebot from crawling a page. If other external websites link to that URL, Google can still index the URL without reading its content. To guarantee de-indexation, use a `<meta name='robots' content='noindex'>` tag instead.
Where must the robots.txt file be located?
Robots.txt must be placed at the absolute root of the domain (e.g. `https://example.com/robots.txt`). Search engine bots will not inspect robots files placed in subdirectories like `https://example.com/assets/robots.txt`.
Are robots.txt directives case-sensitive?
Yes. Path patterns in robots.txt are strictly case-sensitive. `Disallow: /Admin/` will not block `https://example.com/admin/`. However, directive keywords (`user-agent`, `disallow`, `allow`) are case-insensitive.
How do I allow Googlebot while blocking AI scraping bots?
Declare individual blocks for AI user-agents (such as `User-agent: GPTBot`, `User-agent: ClaudeBot`, `User-agent: Bytespider` with `Disallow: /`), followed by `User-agent: *` with `Allow: /` for regular search engines.
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