UUID / GUID Generator
Generate random UUIDs (v4) for use in your applications.
This UUID Generator creates random version-4 UUIDs (GUIDs) — the 128-bit identifiers commonly used as database keys or unique references in code — using your browser's own cryptographic randomness. Choose how many you need in one batch, then copy a single value or all of them at once. Nothing is generated on a server.
How to use
- 1Choose how many UUIDs you need.
- 2Click Generate to create them instantly in your browser.
- 3Copy a single value or all of them at once.
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value formatted as 32 hex digits in groups — practically guaranteed to be unique across systems without any central coordination.
What are UUIDs used for?
Primary keys in databases, unique request/trace IDs in logs, session identifiers, and any place code needs a unique value without relying on a sequential counter or central authority.
What does "v4" mean?
Version 4 UUIDs are generated from random or pseudo-random bits, as opposed to other versions derived from timestamps or hardware addresses — v4 is the most common choice for general-purpose unique IDs.
Are these UUIDs guaranteed unique?
Collisions are astronomically unlikely by design — a version-4 UUID has 122 random bits, generated here using your browser's cryptographically secure random number generator.