UUID Generator

Generate random UUIDs (v4) in various formats instantly.

What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value used to identify resources without a central authority. Version 4 UUIDs, generated here, use cryptographically secure random numbers via crypto.getRandomValues(), making collisions virtually impossible. The standard format is five groups of hexadecimal digits separated by hyphens: 8-4-4-4-12.

UUIDs are widely used in databases, distributed systems, API keys, session tokens, and anywhere a globally unique identifier is needed without coordination between systems. This generator produces RFC 4122 compliant version 4 UUIDs entirely in your browser, with options for uppercase, removing hyphens, or wrapping in braces for different platform conventions.