Robots.txt Tester
Test robots.txt exclusion rules against specific user agents and URL paths using RFC 9309 standards.
About Robots.txt Tester
Search engine crawlers rely on the robots exclusion standard to discover which directories and endpoints on your website they are permitted to crawl. A single formatting error or misplaced slash in your robots.txt file can inadvertently de-index revenue-generating product pages or expose private administrative portals.
Auditing crawler directives before deploying configuration files to production web servers prevents catastrophic organic traffic losses. Standard text editors do not provide immediate syntax linting or user-agent path matching feedback.
This in-browser robots.txt tester evaluates your robots exclusion directives right in your browser. You can test specific user agents such as Googlebot, Bingbot, or custom web scrapers against URL paths to confirm whether access is allowed or blocked.
To control search engine indexing, inspect published URL maps with the XML sitemap validator and verify canonical rules using the canonical URL checker.
Step-by-step practical guide
- Paste the complete raw text of your robots.txt file into the source code workbench.
- Enter a target URL path such as /blog/seo-guide or /admin/login to evaluate.
- Select a specific crawler user agent from the dropdown menu, such as Googlebot, Bingbot, DuckDuckBot, or choose an asterisk wildcard.
- Click the Test Directives button to run the pattern evaluation algorithm.
- Examine the resulting verdict badge showing whether crawling is Allowed or Disallowed.
- Review line-by-line syntax feedback to spot unrecognized directives or trailing space issues.
Engineering specifications and execution details
Complies with the IETF RFC 9309 Robots Exclusion Protocol specification.
Supports standard pattern matching wildcards including asterisk globs and dollar sign end-of-path anchors.
Evaluates rule precedence following standard longest-match priority rules where specific path rules supersede general directives.
Parses key standard directives: User-agent, Allow, Disallow, Sitemap, and Crawl-delay.
Executes entirely within local JavaScript runtime without transmitting site configurations over the network.
Data privacy and memory isolation
Your robots.txt rules and proprietary path structures remain strictly on your local device.
No web requests are dispatched to target URLs during parsing, protecting internal staging environments.
Common production use cases
- Webmasters staging a site redesign to verify that staging disallow rules do not deploy to production.
- SEO specialists troubleshooting indexation drops after recent changes to server routing rules.
- Ecommerce developers validating that faceted navigation filters and cart URLs are properly blocked from crawling.
- Marketing agencies auditing client sites to confirm that XML sitemap locations are properly declared.
- System administrators testing crawl-delay parameters to limit resource exhaustion from aggressive automated bots.
Edge cases and operational boundaries
- Dollar sign anchors: Rules ending with a dollar sign match exact path terminations rather than prefixes.
- Conflicting allow and disallow directives: When rules have equal path lengths, the allow rule takes precedence according to RFC 9309.
- Malformed lines: Unrecognized directive keys are flagged as warnings without halting parser execution.
- Case sensitivity: URL path rules are parsed with strict case sensitivity following HTTP URI standards.
Frequently Asked Questions
Does a disallow rule in robots.txt remove a page from search results?
No. Robots.txt rules control crawling, not indexing. If an external website links to a disallowed URL, search engines may still index the URL without reading its content.
Where should the robots.txt file be hosted on a domain?
The file must always be placed at the absolute root of the domain, accessible directly at https://yourdomain.com/robots.txt.
Are robots.txt rules case sensitive?
Directive names like User-agent and Disallow are case insensitive, but URL paths are strictly case sensitive on standard web servers.
How does Googlebot handle conflicting rules of the same length?
When an Allow rule and a Disallow rule match the exact same character length, modern search engines follow the least restrictive directive, which is Allow.
Can I block private admin pages using robots.txt?
It is not recommended for sensitive security endpoints. Because robots.txt is publicly visible, listing secret paths can reveal them to attackers. Use HTTP authentication instead.
Does this tester make network calls to my server?
No. All syntax analysis and path matching calculations take place entirely in your web browser.