The robots.txt tester works like this: it fetches a site's robots.txt, parses it the way crawlers do, and tests any path against any user-agent you enter. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Robots.txt Tester
Enter the full URL, domain or content the tool asks for.
Run the check - fetch-based tools query the page server-side.
Read the findings as a list, not a single score.
Fix one issue at a time and re-run to verify.
Features
Checks run server-side so protected pages can be read
Results explain the rule or value behind every finding
Copy and export options for every result list
No account needed for any check
Common mistakes to avoid
Auditing a staging or password-protected URL instead of production
Fixing everything at once instead of one change plus re-test
Treating any single score as a ranking promise
Examples
Input
Result
/admin/ vs Googlebot
Blocked - with the exact winning Disallow rule shown
Best used for
Getting a reliable answer for robots.txt tester without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
The URL you check is fetched once so the tool can read pages that block cross-origin browser requests. No browsing history is stored, and nothing from your own device is transmitted.
Frequently asked questions
Why is my path blocked when I never wrote that rule?
Most specific rule wins: a group of directives with long patterns can shadow shorter ones. The tester shows the winning rule so you can trace it.
How do I test whether a crawler can see a page?
Enter the site, the path you care about and the user-agent - the robots.txt rules are evaluated exactly the way that crawler evaluates them, with an allow or block verdict.
What is crawl-delay and does it matter?
A request to slow down between fetches - respected by some crawlers and ignored by others. The tester shows the directive's presence without pretending it is enforced universally.