Generate random version-4 UUIDs (GUIDs) using your browser's crypto-strong randomness. Make one or hundreds at once.
A UUID (universally unique identifier), also called a GUID, is a 128-bit value written as 32 hex digits in the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. Version 4 is random: 122 of the bits come from a random source, so collisions are astronomically unlikely — you can generate them independently on different machines without coordination. The 4 marks the version and the y (one of 8/9/a/b) marks the variant.
These are generated locally with crypto.getRandomValues / crypto.randomUUID — never on a server — so they're suitable for real keys and IDs.