UUID Generator

Generate random UUID v4 identifiers. Everything runs in your browser — nothing is sent to the server.

Generated UUIDs

About UUIDs

UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUIDs are designed to be unique across space and time without requiring a central authority.

Version 4 UUIDs are generated from random (or pseudo-random) numbers. The version nibble is set to 4 and the variant bits are set to 10 (RFC 4122).

Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is random hex and y is one of 8, 9, a, b.

This tool uses crypto.randomUUID() when available, with a fallback using crypto.getRandomValues().