What is a UUID?
A UUID (Universally Unique Identifier), called GUID on Windows, is a 128-bit identifier like 3f2b8c1e-9d4a-4c7e-8b1f-2a6d5e9c0b71. Version 4 UUIDs are random: the chance of two ever colliding is so small that they can be generated independently on any device without coordination.
Frequently asked questions
Is the result truly random?
Yes. We use your browser’s cryptographically secure random number generator (crypto.getRandomValues), the same source used for encryption keys.
Are UUID and GUID the same?
Yes. GUID is Microsoft’s name for the same 128-bit identifier format.