About GUIDsGenerator.com

Learn more about what makes GUIDsGenerator.com your go-to tool for generating GUIDs / UUIDs, who built it and find answers to frequently asked questions.

About the Creator

GUIDsGenerator.com is built and maintained by the developer behind brunovt.be.

As a software developer, I created this tool because I wanted a fast, reliable and RFC compliant way to generate GUIDs / UUIDs during development and testing. I wanted something that just works without sending data to servers and where I have full control over the generation process and formatting. I hope you find it useful too!

REST API

Need to generate GUIDs programmatically? We offer the fastest free REST API with the same formatting and encoding options available as in the generator web interface.

  • Generate 1 or more GUIDs per request
  • Support for UUID v4, v7 and empty (nil)
  • Multiple output formats: JSON array, lines, comma or semicolon separated
  • Encoding options: Base64, Base64URL, URL encoding
  • Formatting: hyphens, braces, quotes, uppercase/lowercase

View Full API Documentation (OpenAPI)

Frequently Asked Questions

GUIDsGenerator.com stands out for several reasons:

  • 100% client-side generation: All GUIDs / UUIDs are generated directly in your browser using cryptographically secure random number generation. No data is ever sent to a server.
  • Multiple GUID / UUID versions: We support both GUID / UUID v4 (random) and GUID / UUID v7 (time-based sortable), giving you the right tool for your use case.
  • Privacy first: No account required. No API calls needed.
  • Rich formatting options: Choose from multiple formats including uppercase, lowercase, with or without hyphens and various encodings.
  • Comprehensive wiki: Learn everything about GUIDs / UUIDs with our detailed documentation and comparisons.

  • No distractions: Just a clean, fast tool that does what you need.
  • Completely free: No premium features, no subscriptions, no hidden costs.
  • No account required: Start generating GUIDs immediately without signing up.
  • Fast and lightweight: The site loads quickly and works offline once loaded.
  • Developer-focused: Built by a developer for developers, with features that matter.
  • Inspect tool: Paste any GUID / UUID to analyze its version, variant and embedded information.

Learn more in our GUID / UUID Wiki.

Yes! Our generator uses the browser's crypto.getRandomValues() API, which provides cryptographically secure random numbers. And we are fully RFC compliant.

Absolutely! The GUIDs generated here use cryptographically secure random number generation and follow the official UUID specifications (RFC 9562). They are suitable for production use in databases, APIs, distributed systems and any other application requiring unique identifiers.

GUID / UUID v4: Generated using 122 bits of cryptographically secure random data from your browser's crypto.getRandomValues() API, with the version and variant bits set according to RFC 9562.

GUID / UUID v7: Generated using a Unix timestamp in milliseconds combined with random bits, providing time-based sortability while maintaining uniqueness.

No, never. All GUIDs are generated entirely in your browser. Nothing is sent to our servers. We don't store, log, or have any way to see the GUIDs you generate. Your privacy is fully protected. See our Privacy Policy for more details.

We support multiple formats to suit your needs:

  • Standard: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
  • Uppercase: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
  • No hyphens: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • Braces: {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
  • Base64: Compact encoding for storage or transmission
  • And more encoding options...

Yes! You can generate multiple GUIDs at once using our generator tool. Simply select the number of GUIDs you need and they will all be generated instantly.

Yes, GUIDsGenerator.com is completely free to use with no limitations. There are no premium tiers, no usage caps and no hidden fees. Generate as many GUIDs as you need, whenever you need them.

Our REST API allows you to generate GUIDs / UUIDs programmatically without any API key or authentication. Simply make an HTTP request to our endpoint and receive your generated identifiers instantly. The API supports UUID v4, v7 and empty (nil) versions.

View Full API Documentation (OpenAPI)

The API supports multiple output formats to integrate seamlessly with your workflow:

  • Response formats: JSON array, newline-separated, comma-separated or semicolon-separated
  • Encoding options: Base64, Base64URL or URL encoding
  • Formatting: With or without hyphens, braces, quotes, uppercase or lowercase

All options available in the web generator are also available via the API.

View Full API Documentation (OpenAPI)

No account is needed. Just visit the site and start generating GUIDs immediately. We believe in keeping things simple and respecting your time.

GUID / UUID v4 is the most widely used version and is recommended for most general-purpose applications. It's purely random and has no time component.

GUID / UUID v7 is newer and includes a timestamp, making it sortable by creation time. This is beneficial for database performance in some cases.

GUID / UUID all versions comparison

Please review our policies to understand how we operate and protect your privacy:

Contact

Have questions, feedback, error corrections or suggestions? I'd love to hear from you! Reach out at [email protected].