UUID / GUID Generator

Bulk generate RFC-compliant UUID tokens instantly. Support for v4 (random), v1 (timestamp/node), and v7 (database ordered). 100% offline-ready.

Understanding UUID & GUID Versions

A Universally Unique Identifier (UUID) is a 128-bit label used for database primary keys, session identification, transaction tracking, and file identifiers. Microsoft refers to this standard as a Globally Unique Identifier (GUID).

Differences Between v4, v7, and v1

  • UUID v4: Constructed fully out of cryptographically strong random values. This is the most common UUID form.
  • UUID v7: Incorporates a Unix millisecond timestamp at the beginning, followed by random entropy. This time-ordering makes it highly optimized for relational databases (like PostgreSQL, MySQL) to prevent index fragmentation.
  • UUID v1: Generated from the exact host computer system timestamp and physical MAC node.