<Marc Nuri>

UUID / GUID Online key generator

Use these UUIDs at your own risk, their uniqueness is not guaranteed.


This is an online tool to generate UUID / GUID. UUID/GUID comes from the acronym Universally/Globally Unique Identifier, which is a 128-bit number used to identify information in computer systems.

You can check the sourcecode for the project at:

Front-End (Gatsby static site)

Back-End (microservice)

What's a version 4 UUID?

Version 4 UUIDs use random numbers for its generation (except for 6 bits reserved for variant and version). Versions 1, 2, 3 and 5 are not completely random and use information such as MAC address and date-time (1/2) or namespace (3/5) for its generation.

This application uses the method randomUUID() of the java java.util.UUID class. The generated keys are type 4 pseudo randomly generated UUIDs. The Java implementation uses java.security.SecureRandom that uses an unpredictable value as the seed in order to comply with RFC 1750 making its output strong and lowering the chances of collisions.

What's the difference between GUID and UUID?

Both terms refer to the same technical concept published in the RFC 4122 specification.

In general, the term GUID is most used across developers using Microsoft technologies.

More information

RFC 4122



RFC 1750

Wikipedia article