UUID Generator Tool
Generate unique identifiers for your applications
UUID Version
Quick Examples:
5
To Generate
0
Total Generated
Generating UUIDs…
Generated UUIDs
UUID Generation Results
UUID Version:
v4 (Random)
Total Generated:
0
Format:
Standard
Uniqueness:
Guaranteed
Structure: 32 hex digits in 5 groups: 8-4-4-4-12
How UUIDs Work
UUIDs (Universally Unique Identifiers) are 128-bit numbers used to identify information:
- Version 1: Time-based with MAC address
- Version 4: Random (most common)
- Nil UUID: All zeros (00000000-0000-0000-0000-000000000000)
- Format: 32 hex digits in 5 groups (8-4-4-4-12)
- Uniqueness: Probability of collision is extremely low
// Example UUID v4:
123e4567-e89b-12d3-a456-426614174000
// Structure:
time_low: 123e4567
time_mid: e89b
time_hi_and_version: 12d3 (version 4)
clock_seq_hi_and_reserved: a4
clock_seq_low: 56
node: 426614174000
Generate UUIDs to see them here
Generation History
Your UUID generation history will appear here
About UUIDs
UUID (Universally Unique Identifier) is a 128-bit label used for information identification.
- Versions: 1 (time-based), 2 (DCE security), 3 (MD5 hash), 4 (random), 5 (SHA-1 hash)
- Probability of Collision: Extremely low (1 in 2.71 quintillion for v4)
- Common Uses: Database keys, session IDs, file names, distributed systems
- Standards: RFC 4122, ISO/IEC 11578:1996
Note: While UUID collisions are statistically improbable, they are not impossible in theory.