UUID Generator
Generate random UUID v4 identifiers. Generate single or bulk UUIDs with one click.
Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and are commonly used as database primary keys, session tokens, and unique identifiers in distributed systems.
What is UUID v4?
UUID version 4 is generated using random or pseudo-random numbers. It has the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hex digit and y is one of 8, 9, a, or b. The "4" in the third group indicates version 4.
Can two UUIDs be the same?
Theoretically yes, but practically no. There are 2^122 possible UUID v4 values (about 5.3 x 10^36). The probability of generating duplicate UUIDs is astronomically low — you would need to generate 1 billion UUIDs per second for 86 years to have a 50% chance of a collision.