UUID Generator

What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier that is unique across both space and time. UUIDs are standardized by RFC 4122 and are widely used in software development to uniquely identify objects, records, sessions, and resources without requiring a central authority to coordinate ID generation.

UUID Version 4 (Random)

This tool generates Version 4 UUIDs, which are created using random or pseudo-random numbers. A v4 UUID has the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is a random hexadecimal digit and y is one of 8, 9, a, or b. The "4" in the third group indicates the UUID version. With 122 random bits, the probability of generating a duplicate UUID is astronomically low.

Common Use Cases

UUIDs are used as database primary keys, API request identifiers, session tokens, distributed system node identifiers, file and resource naming, message queue correlation IDs, and cache keys. They are especially valuable in distributed systems where multiple nodes need to independently generate unique identifiers without coordination. This generator uses the Web Crypto API for cryptographically secure random number generation.