UUID Generator

Create version 4 UUIDs with the Web Crypto API. Nothing is uploaded.

The UUID Generator produces version 4 UUIDs from crypto.randomUUID() — 122 random bits, about 5.3 × 10³⁶ possible values — on your device, never from a server.

09f0182d-25f4-4eb7-8ec7-8435888082d0

What does the UUID Generator do?

A UUID v4 is a 128-bit identifier with random bits. Use them for database keys, request IDs and client-side entities that must not collide.

How does the UUID Generator work?

Each ID is created with crypto.randomUUID(), which uses a cryptographically strong random source in modern browsers. Nothing is requested from a server.

Does this upload my data?

No. This page never sends your input to a server — formatting, decoding and hashing all run in this tab, on this device.How that works.

Frequently asked questions

Which version is this?

Version 4 — random. The variant bits follow RFC 4122.

Are these unique?

Collision is vanishingly unlikely for typical app volumes. They are not sequential and should not be treated as secrets.

Can I generate many at once?

Yes. Generate 10 copies them as a list you can paste into a seed file.

Is a network call involved?

No. The Web Crypto API runs in this process.

Do one job

Generate a UUID v4

Guides

Browse allgeneratorsor thefull tool directory.