Robots.txt Checker
Instantly audit any website – no account required.
UpMonitor's Robots.txt Checker audits your site's robots.txt file for syntax errors, logic contradictions, and accessibility issues. It ensures search engine crawlers like Googlebot and AI crawlers like ClaudeBot and GPTBot can discover your content as intended. Free to use — no signup required.
Audit your Robots.txt configuration instantly to ensure perfect search engine visibility.
Robots.txt is a text file webmasters create to instruct web robots (typically search engine robots) how to crawl pages on their website. The robots.txt file is part of the robots exclusion protocol (REP), a group of web standards that regulate how robots crawl the web.
What Our Robots.txt Checker Validates
Our free validator performs a comprehensive audit of your crawler instructions:
✅ Syntax Validation
Checks for common formatting errors, incorrect use of wildcards (*, $), and unsupported directives that could confuse search engine crawlers.
✅ Sitemap Reference
Ensures your robots.txt includes a valid absolute link to your XML sitemap. This is a critical SEO best practice to help crawlers discover your URLs.
✅ User-Agent Mapping
Verifies that directives are correctly mapped to specific bots. We specifically check for modern AI crawler support (GPTBot, Claude-Web, CCBot).
✅ Disallow Analysis
Audits your Disallow rules to ensure you aren't accidentally blocking critical public pages or your entire website from search engines.
Why Robots.txt Health Matters
| Risk | Impact |
|---|---|
| Blocking CSS/JS | Googlebot cannot render your page correctly, leading to "mobile-unfriendly" errors. |
| Logic Loops | Crawlers waste their "crawl budget" on irrelevant pages, ignoring your new content. |
| Missing Sitemap | Slower discovery of new pages and updates. |
Accidental Disallow: / |
Your entire website is de-indexed from search results within days. |
Common Robots.txt Best Practices
The Standard Sitemap Entry
Always include the full URL to your sitemap at the bottom of the file:
Sitemap: https://yoursite.com/sitemap.xml
Allow AI Crawlers
If you want your content to be discoverable by AI models, ensure you aren't blocking their bots:
User-agent: GPTBot
Allow: /
Frequently Asked Questions
Does robots.txt prevent pages from appearing in Google?
Not always. While it stops crawling, Google might still index a page if it's linked from other websites. To completely hide a page, use a noindex meta tag or password protection.
How often do crawlers check robots.txt?
Googlebot typically checks your robots.txt file at least once every 24 hours, but often much more frequently if your site updates often.
Where should the robots.txt file be located?
It must be at the root of your domain: https://example.com/robots.txt. If it's in a subdirectory, crawlers will ignore it.
Set Up Continuous SEO Monitoring
The free checker above is great for a one-time audit, but your configuration can change during a deployment.
With a UpMonitor account, you can:
- ✅ Monitor your
robots.txthealth 24/7 - ✅ Get instant alerts if a change blocks critical pages
- ✅ Track crawler accessibility over time
- ✅ Receive warnings for syntax regressions