UUID Generator
Generate random UUID v4 identifiers for your applications
About UUIDs
UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across all devices and time. UUIDs are also known as GUIDs (Globally Unique Identifiers).
UUID Format
UUIDs are displayed as 32 hexadecimal digits, shown in five groups separated by hyphens:
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
The "4" indicates version 4 (random), and "y" is one of 8, 9, a, or b.
Common Uses
- Database primary keys
- Session identifiers
- Distributed systems identification
- File naming
- API request tracking
UUID Versions
- v1: Based on timestamp and MAC address
- v4: Random (most commonly used)
- v5: Based on namespace and name using SHA-1