UUID Generator
Generate random UUIDs (v4) instantly
How to Use UUID Generator
- Click Generate to create a new UUID
- Adjust the count to generate multiple UUIDs
- Click any UUID to copy it or use Copy All
Frequently Asked Questions
What is a UUID and what is it used for?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000). It's used for database primary keys, session tokens, and anywhere a unique ID is needed without a central authority.
Are generated UUIDs truly unique?
Yes, for practical purposes. UUID v4 uses cryptographically secure random numbers, giving 2^122 possible values. The chance of a collision is astronomically small โ you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one duplicate.
What is the difference between UUID v1 and v4?
UUID v1 includes a timestamp and MAC address, so it's sortable by time but reveals device info. UUID v4 is fully random and more private. Most modern applications prefer v4.
Can I use UUIDs as database primary keys?
Yes, and it's a common practice. UUIDs allow distributed systems to generate IDs without coordination. The trade-off is slightly larger storage (16 bytes vs 4-8 for integers) and non-sequential ordering.