UUID Generator

Generate version 4 UUIDs in bulk for databases, APIs and testing. Free, fast, and your files never leave your device.

How to use the UUID Generator

  1. Set how many UUIDs you need, from 1 up to 500.
  2. Choose formatting options: uppercase letters, hyphens, or curly-brace wrapping.
  3. Click "Generate" to produce the full batch instantly.
  4. Use "Copy all" to copy every UUID, or "Download .txt" to save them as a file.

Why use ZillaKit's UUID Generator?

UUIDs (Universally Unique Identifiers) are the standard way to generate unique keys for database rows, API resources, session tokens, and test fixtures without needing a central coordinator. This tool generates version 4 UUIDs — the randomly-generated variant — using the browser's native crypto.randomUUID() function, which is built on a cryptographically secure random number generator, so every ID is genuinely unpredictable and collision-resistant. You can generate a single UUID or a bulk batch of up to 500 at once, format them uppercase or lowercase, with or without hyphens, and with or without curly braces (a format some Windows/.NET APIs expect). Everything runs locally in your browser; no identifier you generate is transmitted anywhere, and the tool is completely free.

FAQ

What is a UUID v4?

Version 4 UUIDs are generated using random or pseudo-random numbers, following the RFC 4122 format, giving an astronomically low chance of collision even across billions of generated IDs.

Are these UUIDs guaranteed to be unique?

No generator can offer a mathematical guarantee, but with 122 random bits per UUID v4, the probability of a collision is negligible for virtually any real-world use case.

Can I generate UUIDs without hyphens?

Yes, uncheck "Include hyphens" to get the raw 32-character hexadecimal string, which some systems prefer for storage.

What is the curly-brace format for?

Some Windows APIs and .NET GUID representations wrap the UUID in curly braces, like {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}. Enable that toggle if your target system expects it.

Is there a limit on how many I can generate at once?

You can generate up to 500 UUIDs per click to keep the page responsive; run the generator again for additional batches.