UUID Generator

How to use this UUID generator

  1. A random UUID is generated automatically when the page loads.
  2. Click "Generate New" for another one anytime.
  3. Click the value to select it, then copy.

What is a UUID?

A Universally Unique Identifier is a 128-bit value used to identify information without a central authority. Version 4 UUIDs are generated using random numbers, with a collision probability low enough to treat them as unique.

Where are UUIDs used?

Database primary keys, distributed systems, session tokens, and file names are common uses where you need a unique ID without coordinating with a central server.

How likely is a UUID collision?

Astronomically unlikely — you'd need to generate trillions of UUIDs per second for billions of years before a collision became a meaningful risk.

What's the difference between v4 and other UUID versions?

Version 4 is purely random, while other versions incorporate timestamps or hardware identifiers (v1) or hash-based values (v3/v5) instead — v4 is the most commonly used today.