UUID Generator
Generate random UUIDs (v4). Generate one or bulk generate multiple UUIDs at once.
About UUIDs
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUIDs are used to identify information without requiring a central authority.
UUID Version 4
This tool generates UUID v4 (random). Version 4 UUIDs are generated using random or pseudo-random numbers. The probability of generating duplicate UUIDs is astronomically low (about 1 in 5.3×10^36).
UUID Format
UUIDs are displayed in 5 groups separated by hyphens:
- 8 hexadecimal digits
- 4 hexadecimal digits
- 4 hexadecimal digits (starts with 4 for v4)
- 4 hexadecimal digits (starts with 8, 9, a, or b)
- 12 hexadecimal digits
Example: 550e8400-e29b-41d4-a716-446655440000
Common Use Cases
- Database primary keys
- Session identifiers
- File names for uploads
- Distributed system identifiers
- API request tracking