About this tool
Generate cryptographically-random version-4 UUIDs (GUIDs) one at a time or in bulk. Optionally uppercase them or strip the hyphens. Useful for database keys, test data and unique identifiers.
Frequently asked questions
What is a v4 UUID?
A 128-bit identifier generated from random data, with an extremely low chance of ever colliding — ideal for unique keys.
Are they secure/random?
Yes. They use the browser's crypto.randomUUID, backed by a cryptographically secure random source.