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UUID Generator

Free UUID generator. Create random version 4 UUIDs instantly using your browser's secure random number generator. Nothing is stored or sent.

Your result

Enter your values and select Calculate to see the result.

About the uuid generator

A UUID is a 128-bit identifier that is practically guaranteed to be unique, which makes it useful for database keys, file names, request IDs and anything that must not clash with another record.

Select Calculate to generate a random version 4 UUID using your browser's cryptographic random number generator. Generate as many as you like; nothing is stored or sent to a server.

How to use it

Select Calculate to generate a result.
Use Copy result to save it, or Reset to start again.

Formula

cryptographically random UUID v4

Example

Generate a new identifier whenever you need one.

Frequently asked questions

What is a UUID?

A UUID is a 128-bit identifier written as 32 hexadecimal digits in five groups. It is designed to be unique without a central registry.

Which version does this generate?

Version 4, which is built from random numbers produced by your browser's cryptographic random number generator.

Can two UUIDs ever be the same?

In theory yes, but the chance with version 4 is so small that it is ignored in practice. You would need to generate billions per second for years to see a collision.

Are generated UUIDs stored anywhere?

No. They are created in your browser and are not saved or sent to us.