Robots.txt Tester & Validator
Fetch and validate any site's robots.txt, test whether a specific bot can access a specific path, and see whether AI crawlers like GPTBot and ClaudeBot are blocked.
Free forever · No login required · Checks real AI crawler access
AI crawler access will appear here.
What This Tool Checks
A real fetch and parse of the live robots.txt file — not a cached copy.
- Syntax validation: Flags common mistakes — directives with no User-agent line above them, unrecognized directives, and a full-site block under User-agent: *.
- Bot access simulator: Test whether a specific bot (Googlebot, GPTBot, ClaudeBot, and more) can access a specific path, using the same longest-match precedence rule search engines use.
- AI crawler check: Checks GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, and others against your rules — most robots.txt tools only check traditional search bots.
How To Use This Tool
- 01Enter your domain: We fetch your live robots.txt file directly.
- 02Review the validation: See any syntax issues and which AI crawlers are allowed or blocked.
- 03Test specific paths: Use the simulator to check whether a specific bot can access a specific URL path.
- 04Fix and re-check: Update your robots.txt file, then run the check again to confirm.
No account required, and nothing you enter is stored beyond an anonymous usage count.
Why This Matters
- A misconfigured robots.txt can accidentally block Google entirely, or block CSS/JS files search engines need to render your pages properly.
- AI answer engines (ChatGPT, Claude, Perplexity) use their own crawlers — if those are blocked, your site can never be cited in AI answers, no matter how good your content is.
- This is one of the few places a single line of misconfiguration can undo months of SEO work.
- Checking AI crawler access specifically is a newer, GEO-specific consideration most traditional robots.txt tools still don't cover.
Related tools and resources: AI Meta Title & Description Generator.
Frequently Asked Questions
A plain-text file at the root of a domain (yoursite.com/robots.txt) that tells web crawlers which parts of the site they're allowed to access.
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