UUID Generator

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. Version 4 UUIDs are randomly generated using cryptographic randomness, making collisions virtually impossible.

• Database primary keys — avoid sequential IDs that leak information
• Distributed systems — generate unique IDs without coordination
• API request IDs — trace requests across microservices
• Session tokens — random, unguessable identifiers
• File names — unique names without checking for conflicts

This generator uses crypto.getRandomValues() for cryptographically secure randomness. The probability of generating a duplicate is astronomically low — you'd need to generate 1 billion UUIDs per second for about 85 years to have a 50% chance of one collision.