Robots.txt Generator Online (100% Free & Private)
Free robots.txt generator that runs in your browser. No sign-up, no install.
Robots.txt Generator & Tester
Builds a robots.txt and tests URLs against it using Google-style matching: longest rule wins, Allow wins ties, * and $ wildcards, per user-agent groups.
Block AI crawlers (adds a group per bot with Disallow: /)
robots.txt is a request, not enforcement. Well-behaved crawlers honor it; others may not.
User-agent: * Disallow: /admin/ Disallow: /cart/ Disallow: /*?sort=
Path tester (runs against the file above)
Group "*": the longest matching rule is "Disallow: /admin/".
What this tool does and who it is for
This tool builds a robots.txt from the paths you want to block or allow, with optional blocks for common AI crawlers, and tests any URL against the file using Google-style matching. The longest matching rule wins, Allow wins a tie, and * and $ wildcards work. User-agents are matched by group.
The tester runs against the exact file shown, so you can see which rule decides each path. Crawl-delay is optional and is written only for Bing and Yandex, because Googlebot ignores it.
Official Formula / Technical Standard
Real-World Worked Scenario
Enter your target URL and parameters to produce standard-compliant markup and tracking directives.
When people use it
Keeping admin and cart pages out of crawls
List the paths, add an Allow exception for any public subfolder, and test a few real URLs.
Opting out of AI crawlers
Tick the bots you want to block. The output adds a Disallow: / group for each.
Checking a wildcard rule
Test /*?sort= or /*.pdf$ against real URLs to confirm they match what you intend.
Notes for US users
- The file must live at the root, for example https://example.com/robots.txt.
- Each subdomain needs its own robots.txt.
Limits and what to double-check
- •robots.txt is a request. Compliant crawlers follow it, others may not.
- •Blocking a URL stops crawling, not indexing. Use noindex on a crawlable page to keep it out of results.
- •The matcher follows Google's documented behavior. Other crawlers may differ in edge cases.
Expert Best Practices & Common Pitfalls
Recommended Best Practices
- •Adhere strictly to official Google Search Central guidelines and character length bounds.
- •Test generated markup in Google's Rich Results Test before publishing.
- •Keep URLs, tags, and tracking parameters standardized and documented across your marketing team.
Common Mistakes to Avoid
- •Using inconsistent naming conventions or mixed uppercase letters in campaign tracking.
- •Stuffing unnatural keywords into page titles and meta descriptions.
- •Publishing broken or non-canonical URL structures that fragment search equity.
Features & Security Architecture
- 100% Client-Side: Zero server uploads ensure complete privacy and data confidentiality
- Fast Results: Processing happens on your own device, so there is no upload or server queue to wait for
- No Sign-Up Required: Completely free to use with no daily usage caps or account requirements
- Works on All Devices: Fully responsive across desktop, tablet, and mobile browsers
Frequently Asked Questions
How does the Robots.txt Generator work?▼
The Robots.txt Generator runs 100% inside your web browser using modern client-side JavaScript. It performs calculations, conversions, and document processing locally on your device without sending any data to external servers.
Is this robots.txt generator completely free to use?▼
Yes. This tool is completely free with no usage limits, no subscriptions, and no registration required.
Is my data private when using the Robots.txt Generator?▼
Yes. Because all operations execute locally on your computer or phone, your inputs, documents, and data never leave your browser.
Does Google obey Crawl-delay?▼
No. Bing and Yandex honor it, which is why it is offered only for those two.
What happens when Allow and Disallow both match?▼
The longer pattern wins. If they are the same length, Allow wins.
Does blocking GPTBot hide my site from ChatGPT?▼
It asks OpenAI's training crawler to stay out. Other bots, such as OAI-SearchBot and ChatGPT-User, are separate and have their own checkboxes.
Should I block Google-Extended?▼
It is a control token for certain Google AI uses and does not affect Google Search. Block it only if that matches your policy.