UUID Generator
Generate universally unique identifiers (UUID v4) for your applications.
UUIDs
670432d9-8256-49dd-9c0d-4f9cd52aae20What is This Tool?
A UUID (Universally Unique Identifier) is a 128-bit label used to identify information in computer systems. Version 4 UUIDs are randomly generated and have an extremely low probability of collision, making them ideal for database primary keys, session tokens, and distributed system identifiers.
Formula
UUID v4 format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Where:
x = random hex digit (0-f)
4 = version indicator (always 4)
y = variant indicator (8, 9, a, or b)
Total: 2^122 possible UUIDs (~5.3 x 10^36)Worked Examples
1. Generate single UUID
Given: Click Generate
Generate 128 random bits
Set version bits (0100) at position 48-51
Set variant bits (10) at position 64-65
Format as hex with dashes
Result: e.g. 550e8400-e29b-41d4-a716-446655440000
2. Bulk generation
Given: Count: 5
Generate 5 independent random UUIDs
Each with unique random bits
Result: 5 unique UUID strings
Frequently Asked Questions