What is a UUID Generator?
A UUID (universally unique identifier) is a 128-bit ID like 3f8a…-…-… used for database keys, request IDs and distributed systems where two machines must never mint the same ID.
This generator uses the browser’s built-in crypto.randomUUID(), the same cryptographically secure source your applications use, not a predictable pseudo-random shortcut.
Frequently asked questions
Can two generated UUIDs collide?
The probability is so small it is treated as zero in practice: you would need to generate billions per second for centuries to expect a collision.
What version are these UUIDs?
Version 4: fully random, the right default for identifiers. Version 7 (time-ordered) support is planned.
Are the UUIDs generated on a server?
No: they are generated in your browser with a cryptographically secure random source.
Uppercase or lowercase?
Lowercase, per RFC 4122’s canonical form. Systems that want uppercase accept it after a simple transform.