UUID (GUID) Generator

This is a client-side UUID/GUID generator which uses your browser to generate random Variant 4 UUIDs.

Version 4 UUID generation

This tool generates Version 4 UUIDs/GUIDs, which are randomly generated^[1].

This is in contrast to other UUID variants which can include elements that are based on time, namespace and MAC address.

There are 5.3 undecillion^[2] possible Version 4 UUIDs and while it’s not impossible to find UUID collisions, for pretty much all practical purposes the chance is so close to zero that UUIDs can be considered effectively unique.

More about UUIDs

The terms UUID and GUID are interchangeable. Although the generation method differs for different variants of UUID, the format of all UUIDs/GUIDs regardless of the variant is always the same.

Specifically, all UUIDs are made up of 32 hexadecimal (base-16) characters, separated into five groups by hyphens. Thus a UUID is generally 36 characters long (32 hexadecimal digits plus 4 hyphens).

UUIDs can be represented as lower or upper case, with or without surrounding braces, and sometimes (although rarely) without the hyphens. So it's worth bearing this in mind when validating UUIDs or scoping storage requirements.

[1] Because this is a client-side UUID generator, using WebAssembly, the random number generation happens on your local machine and not our servers. The "randomness" therefore may rely on your browser and operating system's random number generation implementation.

[2] lots