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Free Robots.txt Syntax Tester & Validator

Test existing robots.txt files for free to detect syntax errors, check crawler access rules, and ensure search bots index your key pages.

Validation Settings

Fetched server-side, so there is no CORS issue. Public and private sites both work as long as the URL is reachable.
Validation Result
Syntax & Issues
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About the Validator

Fetch and test robots.txt rules for any domain. Simulate how Googlebot, Bingbot, GPTBot, and other crawlers interpret your site's directives.

Supports wildcard patterns (*), end anchors ($), and disallow/allow precedence logic.

Need to build a robots.txt file first?
Open Generator

How to Use the Robots.txt Validator

Fetch or paste a robots.txt, select a user-agent, and test a URL path to check access rules.

1. Provide Source

Enter a robots.txt URL and fetch it, or paste the file contents into the textarea.

2. Choose User-Agent & Path

Select the crawler you want to simulate - Googlebot, Bingbot, GPTBot, and more - and enter a URL path to test.

3. Run Validation

Click 'Run Validation' to see whether the chosen user-agent can access the URL path, plus any syntax errors or warnings.

Frequently Asked Questions

The Robots.txt Validator checks your robots.txt rules and simulates how different search engine crawlers interpret them. It helps you identify errors, conflicts, and unintended blocks before they affect crawling.
Enter a domain or full robots.txt URL in the fetch field, then click Fetch. The validator retrieves the file using a server-side request and tests it against the user-agent you select.
Yes. You can paste robots.txt content directly into the editor to validate rules before uploading the file to your site.
This tool tests crawling rules only. Robots.txt controls whether bots can access URLs. It does not control indexing. To prevent indexing, use meta noindex tags or HTTP headers.
You can simulate common crawlers such as Googlebot, Bingbot, GPTBot, and a generic user agent. This helps ensure different bots interpret your rules correctly.
Yes. Enter a URL path to check whether the selected user agent is allowed or blocked from crawling that specific page based on your robots.txt rules.
If the domain can't be reached or blocks automated requests, paste the robots.txt content manually into the validator to continue testing.
Yes. The validator supports wildcard patterns, anchors, and allow or disallow precedence so results reflect real crawler behavior.
You can simulate custom bots by using the generic user agent option, which applies default crawling rules when a specific bot is not listed.
Yes. The validator is completely free and does not require sign-up.
Yes. Validating robots.txt ensures AI-related crawlers follow the correct access rules, helping you control which parts of your site can be crawled by AI systems.

Still stuck? Contact us.

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