Robots.txt Tester & Validator

Validate your robots.txt file, check URL access rules, and test against Googlebot, Bingbot, and other crawlers. Detects syntax errors instantly.

robots.txt Content

Quick examples

Syntax Validator

Flags invalid directives, missing values, and logic errors as you type — no button needed.

URL Checker

Test individual or bulk URLs — instantly see Allowed or Blocked with the exact matching rule.

Bot Simulation

Choose Googlebot, Bingbot, DuckDuckBot, or enter a custom user-agent to simulate any crawler.

Live Fetch

Enter any domain to fetch its live robots.txt directly — no copy-pasting needed.

How this Robots.txt Tester works

This validation tool analyzes 'robots.txt' files to identify syntax errors, logic conflicts, or reachability issues. Users can paste their file content or enter a URL to fetch it live. The tester simulates search engine crawler behavior against specific paths to verify if they are allowed or blocked. It simulates Googlebot and other major agents, helping webmasters confirm that their access rules are working as intended before deploying changes that could accidentally de-index their entire site.

How to use this Robots.txt Tester

1

Paste or Fetch

Enter your robots.txt content or fetch it live from any domain.

2

Validate

Syntax is checked automatically — errors and warnings appear instantly.

3

Test URLs

Enter URLs and select a crawler to see Allowed or Blocked results.

Frequently Asked Questions

What is a robots.txt tester?
A robots.txt tester validates the syntax of your robots.txt file and simulates how search engine crawlers read it. You can test whether specific URLs are allowed or blocked for Googlebot, Bingbot, and other crawlers.
How does the robots.txt validator work?
Paste your robots.txt content (or fetch it from a live domain) and the tool parses it line by line. It flags syntax errors and unknown directives, then lets you test any URL path against the rules for your chosen crawler.
What is the correct rule precedence in robots.txt?
Google uses a 'most specific match wins' algorithm. The Allow or Disallow rule with the longest matching path takes effect. If an Allow and Disallow rule are equally specific, Allow takes precedence. This tool replicates that behavior.
Why is my URL blocked even though I have an Allow rule?
The Disallow rule is probably longer (more specific) than your Allow rule. For example, 'Disallow: /admin/private/' overrides 'Allow: /admin/'. Make your Allow path more specific, or check that the Allow rule is under the correct User-agent group.
Can I test multiple URLs at once?
Yes. Switch to the Bulk Test tab and paste one URL per line. All URLs will be tested against the same user-agent and the results are shown in a table.
Is this robots.txt checker secure?
URL testing and validation run 100% in your browser — your robots.txt content is never uploaded to a server. The 'Fetch from domain' feature sends a server-side request to retrieve only the public robots.txt file.

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The Robots.txt Tester is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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