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UUID Generator

Browser processing — files never leave your device

Generate version-4 UUIDs using your browser's cryptographic random source. Create one or a batch, with uppercase and hyphen-free formatting options.

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How to use this tool

  1. Choose how many UUIDs you need.
  2. Toggle uppercase or hyphen removal if your system requires it.
  3. Click Generate.
  4. Copy one UUID or the whole list.

About this tool

UUID v4 identifiers are 128-bit values with 122 random bits — enough that collisions are not a practical concern, which is why they're the default choice for database keys, request IDs and file names. Generation uses the Web Crypto API (crypto.randomUUID / getRandomValues), the same quality of randomness your backend would use, and happens on your device: the IDs you generate are never known to anyone else.

Frequently asked questions

Can two generated UUIDs collide?
The probability is astronomically small — you would need to generate about 2.7×10^18 UUIDs for even a 50% chance of one collision. Treat v4 UUIDs as unique.
What's the difference between UUID and GUID?
Nothing practical — GUID is Microsoft's name for the same 128-bit identifier format.
Are these UUIDs predictable?
No. They come from the browser's cryptographic random generator, not a seeded pseudo-random function, and they never leave your machine.

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