UUID Generator
Generate unique identifiers (UUID v1 & v4)
UUID Settings
Validate UUID
Generated UUIDs
Click "Generate" to create UUIDs
Frequently asked questions
What's the difference between UUID v1 and v4?
UUID v1 uses timestamp and MAC address, making it somewhat predictable but guaranteed unique. UUID v4 is completely random, offering better privacy but a tiny theoretical collision chance (1 in 5.3×10^36).
Are UUIDs globally unique?
Practically yes. The chance of generating duplicate UUID v4s is astronomically low—you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.
Should I use UUIDs as database primary keys?
UUIDs work well for distributed systems where you can't coordinate ID generation. However, they're larger than integers and can impact index performance. Consider your use case and database type.