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Robots.txt Validator

Validate robots.txt syntax locally, check user-agent groups, allow and disallow rules, and catch unknown directives.

Local processing

Robots.txt Validator

What is Robots.txt Validator?

Robots.txt Validator checks a robots.txt file for syntax problems before it is published. It groups user-agent records, lists allow and disallow rules, and flags unknown directives or missing fields.

How It Works

The text is parsed line by line. Known directives such as User-agent, Allow, Disallow, Sitemap and Crawl-delay are recognized, comments are ignored, and issues are reported with line numbers.

Common Use Cases

  • Checking staging and production robots files
  • Catching typos before deployment
  • Auditing crawl rules for SEO
  • Reviewing client robots.txt files

Technical Details

Parsing and validation run entirely in the browser. The tool does not fetch a live URL or execute crawl requests.

How to Use

Enter your input above. The result updates automatically. Use the copy button to copy the result.

Privacy

All processing happens in your browser. Your data is never uploaded to any server.

FAQ

Does it fetch the live robots.txt file?

No. You paste the file contents, so the tool works for drafts and staging files without any network request.

Is my data uploaded to a server?

No. Everything runs locally in your browser. Your input never leaves your device.

Does Robots.txt Validator work on mobile?

Yes. The interface is responsive and works in modern mobile browsers without installing an app.

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