DailyAppsUUID Generator
Generate cryptographic strength random UUIDs (Version 4) in your browser. Fast, secure, and client-side only.
What is a UUID?
A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. usage of UUIDs is significant in distributed systems where many independent systems need to generate unique identifiers without coordination.
Standard UUIDs look like this: 123e4567-e89b-12d3-a456-426614174000. They are composed of 32 hexadecimal characters displayed in five groups separated by hyphens.
Format Breakdown (8-4-4-4-12)
| Group | Length | Description |
|---|---|---|
| xxxxxxxx | 8 chars | Time-low (in v1) or random (v4) |
| xxxx | 4 chars | Time-mid |
| 4xxx | 4 chars | Version and Time-high. Starts with 4 for random UUIDs. |
| yxxx | 4 chars | Variant and Clock-seq. digits. y is 8, 9, A, or B. |
| xxxxxxxxxxxx | 12 chars | Node (MAC address in v1) or random (v4) |
Why use UUID v4?
Collisions are Improbable
With 2^122 possible UUIDs, you would need to generate 1 billion UUIDs per second for about 85 years to have a 50% probability of a single collision.
No Coordination
Systems can generate IDs independently without checking a central database, making them perfect for offline-first apps and distributed databases.