UUID Generator
Generate random version 4 UUIDs instantly, using your browser's cryptographic random number generator. Create 1, 5 or 10 at a time, copy one or copy them all — nothing is uploaded or logged.
Your UUIDs
Version 4 UUIDs are random — the chance of two of them colliding is so small it can be ignored in practice.
How to use
- Choose how many UUIDs you need — 1, 5 or 10.
- Click Generate UUIDs to create fresh random version 4 UUIDs.
- Copy one UUID with its Copy button, or copy them all at once.
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label written as 32 hexadecimal digits in five groups, like 550e8400-e29b-41d4-a716-446655440000. It is used to identify records, files and objects without a central registry.
What does version 4 mean?
Version 4 UUIDs are generated from random numbers — 122 of the 128 bits are random. The version digit is always 4 and the variant bits follow the standard, so you can tell a v4 UUID by the 4 in its third group.
Are these UUIDs really random?
Yes. They are built from crypto.getRandomValues, the browser's cryptographic random source — the same kind of randomness used for security keys, not the weaker Math.random().
Does anything get stored or logged?
No. UUIDs are generated in your browser and never sent anywhere. Refresh the page and they are gone.