UUID Generator
Generate unique identifiers (UUIDs/GUIDs) in various formats
Generator Settings
Example: 550e8400-e29b-41d4-a716-446655440000
About UUIDs
What is a UUID?
A Universally Unique Identifier (UUID) is a 128-bit identifier used to uniquely identify objects or entities. UUIDs are designed to be unique across space and time without requiring a central authority.
UUID Version 4
Version 4 UUIDs are randomly generated. They have the format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, A, or B.
Common Use Cases
- • Database primary keys
- • API identifiers
- • Session tokens
- • File naming
- • Distributed systems
Collision Probability
The probability of generating duplicate UUIDs is negligibly small. You would need to generate about 2.71 quintillion UUIDs to have a 50% chance of creating one duplicate.