Robots.txt Validator
Fetch and validate any website's robots.txt file — check directives, sitemap references, and common issues. 100% free.
Why Robots.txt Validator Matters
A single misconfigured Disallow rule in robots.txt can block Googlebot from crawling your entire site — silently removing pages from search results without any visible errors. Validating your robots.txt is the first check in any technical SEO health review.
Crawlability Health
Instantly see which user-agents are blocked, which paths are disallowed, and whether your sitemap is referenced correctly.
Issue Detection
The tool flags common problems — missing sitemaps, wildcard overblocking, and conflicting directives — in a single scan.
- A missing Sitemap directive means Google relies entirely on external links to discover your pages.
- Blocked CSS and JS files can prevent Google from rendering pages correctly, hurting indexing.
- Validate robots.txt after every CMS migration or platform upgrade — they often reset it.
How to use Robots.txt Validator
Enter Your Website URL
Provide your domain — the tool automatically fetches the robots.txt from the correct root path.
Review Directives
See all user-agent rules, allowed and disallowed paths, broken down by bot.
Check Sitemap References
Confirm your sitemap.xml URL is declared in the robots.txt so crawlers find it immediately.
Fix Any Issues Found
Address flagged problems — remove over-broad Disallow rules and add missing Sitemap directives.
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Instant Results
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Technical Crawlability Audit Workflow
Add robots.txt validation to your regular site health checks to catch crawl-blocking errors before they impact indexing and organic traffic.
Recommended implementation sequence
SEO Workflow Map
Run the Validator
Fetch your robots.txt and review all user-agent directives in one view.
Check for Over-blocking
Look for Disallow: / rules or wildcards that could block important page categories.
Verify Sitemap Entry
Ensure your primary sitemap URL is listed with the Sitemap: directive.
Re-validate After Changes
Whenever your CMS, platform, or hosting changes, re-run this check to catch silent resets.
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Frequently Asked Questions
Everything you need to know about robots.txt validator.
Robots.txt is a text file in your website's root that tells search engine bots which pages or sections they can and cannot crawl. It's checked before any page is visited.
No — blocking crawling doesn't prevent indexing. If other sites link to a blocked page, Google may still index it. Use the noindex meta tag or x-robots-tag header to prevent indexing.
At minimum, include a Sitemap directive pointing to your sitemap.xml. Only disallow pages that truly shouldn't be crawled (admin pages, duplicate content). Don't block CSS or JS files.
Yes — this is one of the most common technical SEO mistakes. A misconfigured Disallow rule can prevent Googlebot from crawling your entire site, wiping it from search results. Always validate after changes.
You can use specific user-agent directives to block aggressive scrapers and AI training bots like GPTBot or CCBot while keeping Googlebot unrestricted. This tool shows you all user-agent rules at once.
Fonzy's audit checks your robots.txt during setup to ensure generated pages are crawlable and no important resources are accidentally blocked.