UUID v4 Generator
Generate cryptographically random, RFC 4122 compliant UUIDs
0 UUIDs
Quick Guide
- Set quantity (1–1000) and click Generate
- Toggle Uppercase or Remove Dashes and regenerate
- Uses
crypto.getRandomValues()— neverMath.random()
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens:
550e8400-e29b-41d4-a716-446655440000
What is UUID v4?
Version 4 UUIDs are randomly generated using a cryptographically secure random number generator. They are RFC 4122 compliant, not sequential, and have an astronomically low collision probability — roughly 1 in 5.3 × 10³⁶.
When to Use UUIDs
Database primary keys
Safe for distributed systems without a central ID counter
Public API identifiers
Expose IDs without leaking sequential row counts
File identifiers
Unique filenames for uploads and generated assets
Session tokens
Temporary identifiers for user sessions and requests