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Free Robots.txt Validator

Scan your robots.txt file, detect errors, and ensure search engines can crawl your site correctly and safely.

Validation Settings

The robots.txt will auto-fetch when you leave this field. If direct fetch is blocked by CORS, this tool retries through a public proxy (allorigins.win).

Validation Result

Click “Run Validation” to see results.

About the Validator

Automatically 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.

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

1. Provide Source

Enter a robots.txt URL or paste the file contents into the textarea.

2. Choose User-Agent

2. Choose User-Agent

Select the crawler you want to simulate (Googlebot, Bingbot, GPTBot, etc.).

3. Run Validation

3. Run Validation

Click 'Run Validation' to see whether the chosen User-Agent can access the URL path.

Frequently Asked Questions

What does the Robots.txt Validator do?
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. The validator will automatically retrieve the file using server-side requests and test it against selected user agents.
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 your site blocks public proxies, fetching robots.txt may fail. In that case, 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 have questions? Contact us.

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