UUID Generator Privacy: All processing runs locally
Generate universally unique identifiers (UUID v4) using crypto.randomUUID() with a polyfill fallback.
How It Works
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information. Version 4 UUIDs are randomly generated and follow the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is any hexadecimal digit and y is one of 8, 9, a, or b.
This tool uses crypto.randomUUID() when available (modern browsers), falling back to a polyfill that uses crypto.getRandomValues() for older browsers. Both methods produce cryptographically secure random values.
UUID v4 provides 122 bits of randomness, making collisions astronomically unlikely. They are widely used as database primary keys, session tokens, correlation IDs, and unique file names.