UUID Generator
Generate cryptographically-random version 4 UUIDs in bulk, instantly in your browser.
About the UUID Generator
A UUID (universally unique identifier) is a 128-bit value used as a collision-resistant ID for database rows, API keys, files and distributed systems. Version 4 UUIDs are generated from random data.
These are produced with your browser’s cryptographic random generator and never leave your device — safe to use for real identifiers.
Frequently asked questions
Version 4 UUIDs have 122 random bits — the chance of a collision is astronomically small, so they are treated as unique in practice.
Yes — we use the Web Crypto API (crypto.getRandomValues / crypto.randomUUID), which is cryptographically secure.
GUID is Microsoft’s name for the same 128-bit UUID standard — they are interchangeable.