UUID Generator
Generate cryptographically-random version-4 UUIDs (also called GUIDs). Create as many as you need at once and copy them all in one click.
What version-4 UUIDs are good for
A UUID is a 128-bit identifier that's practically guaranteed to be unique without a central authority — ideal for database primary keys, request IDs, file names, and idempotency keys. Version 4 UUIDs are mostly random, so the chance of a collision is astronomically small.
These are generated with your browser's cryptographic random source (crypto.randomUUID), the same generator used for security tokens. Create them in bulk and copy them all at once.
How to use UUID Generator
- 1Set how many UUIDs you want.
- 2Toggle hyphens and letter case to match your needs.
- 3Click Generate, then Copy all.
Frequently asked questions
How random are these UUIDs?
They use your browser's cryptographic random source (crypto.randomUUID), the same secure generator used for tokens.
What is a version-4 UUID?
A 128-bit identifier where most bits are random, giving an astronomically low chance of collisions.
Are the UUIDs generated on a server?
No — they're generated locally in your browser and never leave your device.