What the Robots.txt Generator & Validator Does
The Robots.txt Generator & Validator is a browser-based tool designed to help you create and check rules for web crawlers, such as Googlebot, to follow when they visit your website. With this tool, you can build a custom robots.txt file by adding different rules for various crawlers and then test specific website paths to see if a crawler would be allowed or blocked based on those rules.
The tool starts with a default configuration containing a User-agent: * and Disallow: /admin. As you build your file, the tool provides a real-time preview of the generated robots.txt, displays the total number of rules, and flags any issues found in the rules.
Creating Crawl Rules and Configuring Inputs
To generate your robots.txt file, the tool accepts several inputs to define how crawlers should interact with your website:
- User-agent: The name of a specific crawler, or
*to apply the rules to all crawlers. User-agent names cannot contain spaces. - Path: A website path that must start with
/and cannot contain spaces. - Sitemap URL: A full
http://orhttps://address pointing to your sitemap.
When configuring these inputs, the tool validates your entries against specific syntax requirements and flags errors directly in the interface:
- If a user-agent name contains spaces or is left blank, it triggers the error: Enter one user-agent name without spaces, or use * for all crawlers.
- If a rule path does not start with
/or contains spaces, it triggers the error: Rule paths must start with / and cannot contain spaces. - The
$character can only be used at the end of a rule path. If it is placed elsewhere, the tool displays: Use $ only at the end of a rule path. - If a sitemap URL is incomplete, the tool flags it with: Sitemap URLs need a full http:// or https:// address.
Understanding Rule Validation and Warnings
As you build your robots.txt file, the validator automatically checks for structural issues, conflicts, and size limitations. The tool displays either No syntax or rule conflicts found. or a warning indicating the number of issues to review.
The validator flags the following specific edge cases and Google-specific behaviors:
- Duplicate Rules: If a rule is repeated for the same user-agent, it is flagged as: This rule is repeated for the same user-agent.
- Conflicting Paths: If an Allow and a Disallow rule use the exact same path, the tool flags it with: Allow and Disallow use the same path. Google applies Allow when both are equally specific.
- Duplicate User-Agents: If the same user-agent is named in multiple groups, the validator warns you: Google combines groups that name the same user-agent.
- Size Limits: If the generated robots.txt exceeds 100,000 characters, the tool flags it with: This robots.txt is too large to review here.
Testing Path Access and Crawler Rules
The validator includes a path-testing utility that allows you to check if a specific URL path on your website is accessible to a chosen crawler. To run a test, you provide:
- URL path: The specific path on your website you want to test (which must start with
/). - Crawler: The name of the crawler you want to test the path against.
When checking paths, the tool follows Google's matching order, where the longest matching path wins. If matching Allow and Disallow rules are equally specific, the Allow rule wins.
After running the test, the tool will output one of three results:
- Allowed —
{rule}: Indicates that the tested path is allowed and displays the specific rule that permits it. - Blocked —
{rule}: Indicates that the tested path is blocked and displays the rule that blocks it. - No matching rule. Google allows this path by default.: Indicates that no rule applies to the tested path, meaning crawlers can access it.
Who Needs to Use This Tool
This tool is designed for anyone who needs to manage how search engines and other automated bots interact with their web content. Specifically, it is useful for:
- Website maintainers who want to control how web crawlers access their site.
- Developers who need to create, modify, or troubleshoot robots.txt files.
- Anyone who wants to prevent crawlers from accessing specific parts of their website, such as administrative folders or private directories.
- Users who want to ensure that important pages are not accidentally blocked from crawlers, preserving their visibility in search engines.
Privacy and Data Processing
Your privacy is maintained while using this tool. Your crawl rules are created and checked entirely in your browser. Nothing is uploaded to BroBroGo.
Frequently Asked Questions
What can this generator add to robots.txt?
You can add a user-agent group, Allow and Disallow paths, and one or more sitemap URLs. The preview is ready to copy into a robots.txt file.
How does the path checker choose a rule?
It follows Google’s matching order: the longest matching path wins. If matching Allow and Disallow rules are equally specific, Allow wins.
Does Disallow remove a page from Google Search?
No. A blocked page can still appear in search results when other pages link to it. Use noindex, access control, or remove the page when you need it kept out of search. (Note that this tool does not check for noindex, access control, or page removal).