Robots.txt Validator
Validate a site's robots.txt file. Enter a URL and we'll fetch and check the robots.txt for proper syntax and common issues.
About this Robots.txt Validator
Validate a website's robots.txt file to ensure it follows the correct syntax and that search engine crawlers will interpret it as intended. We fetch the robots.txt from the given URL and check for common issues.
Key Features
Validate robots.txt syntax
Check for common crawling issues
View fetched robots.txt content
See errors and warnings
Works with any public URL
Server-side fetch—no CORS issues
How to Use
Enter the full URL of the site (e.g. https://example.com)
Click Validate
Review the result: valid, errors, or warnings
Use the raw response for debugging if needed
Popular Use Cases
Verify robots.txt before launch
Debug crawl blocking or allowing issues
Check syntax after manual edits
Audit SEO and crawler directives
Ensure sitemap and disallow rules are correct
Tips & Best Practices
robots.txt is fetched from the origin (e.g. https://example.com/robots.txt).
Ensure your server returns robots.txt with a 200 and text/plain when appropriate.
Use Disallow and Allow carefully; crawlers may have different interpretations.
Frequently Asked Questions
What is robots.txt?
robots.txt is a file at the root of a site that tells search engine crawlers which paths they may or may not request. It uses directives like User-agent, Allow, and Disallow.
Does this tool change my robots.txt?
No. We only fetch and validate the file as it is. We do not modify your site or file.
What if my site has no robots.txt?
If the URL returns 404 or no file, the validator will report that. Many sites work fine without a robots.txt (crawlers are allowed everywhere by default).
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