Robots.txt Tester – Validate Robots.txt Rules Online Free
About the Robots.txt Tester and Validator
The Robots.txt Tester and Validator checks your robots.txt file for syntax errors and shows exactly which crawl rules apply to a specific search engine bot. Simply enter your site’s robots.txt URL or paste the content directly, choose a user agent like Googlebot or Bingbot, and instantly see the active Allow/Disallow rules along with any warnings or errors in the file.
This tool is built for SEOs, developers, and site owners who want to confirm their robots.txt is working as intended before it affects crawling and indexing. It catches common mistakes — missing colons, unknown directives, misplaced rules, and invalid sitemap URLs — helping you avoid accidentally blocking important pages from Google or other search engines. If you still need to create a robots.txt file, you can use our Robots.txt Generator, and make sure your sitemap is ready with the Sitemap Generator.
We checked this tool with different robots.txt files and user-agent rules to make sure it reports syntax issues and matching crawl directives accurately.
How to Use the Robots.txt Tester and Validator
- Enter your site’s Robots.txt URL (e.g. https://example.com/robots.txt), or paste the file content directly.
- Select a User Agent from the list (like Googlebot, Bingbot, AhrefsBot) or type your own.
- Click “Test” to run the validation.
- Review the syntax status — Valid or Errors Found.
- Check any Warnings for potential issues like misplaced rules or invalid sitemap URLs.
- View the Active Rules table to see exactly what’s allowed or disallowed for your selected user agent.
- Expand “View Raw robots.txt Content” to see the full file that was checked.
Frequently Asked Questions
If you’re reviewing your site’s technical SEO, you may also want to use our Redirect Chain Checker to identify redirect issues that can affect crawling.
It checks your robots.txt file for syntax errors, unknown directives, and misplaced rules, and shows which Allow/Disallow rules apply to a specific search engine bot.
Yes, paste your robots.txt content directly into the tool instead of providing a URL to test it before publishing.
The tool flags sitemap entries that aren’t valid, fully formed URLs, since an incorrect sitemap URL won’t be recognized by search engines.
If no robots.txt is found, the tool confirms this and notes that all URLs are allowed to be crawled by default.
Yes, select any user agent from the list, and the tool displays the specific rules that apply to that bot, along with any wildcard (*) rules.
Yes, this tool is completely free with no signup required.
