UUID Generator (v4)

Generate random UUIDs (version 4) one at a time or in bulk. Created in your browser using a cryptographic random source.

How many Uppercase Include hyphens

UUIDs

Generate Random UUIDs Online

A UUID (universally unique identifier) is a 128-bit value that is practically unique without any central coordination. Version 4 UUIDs are random, which makes them popular as database keys and request IDs.

This tool generates v4 UUIDs in your browser using the Web Crypto API.

Key features

Version 4 (random) UUIDs
Generate up to 500 at a time
Uppercase and no-hyphen options
Cryptographically secure randomness

Example

3b241101-e2bb-4255-8caf-4136c566a962

How to use

Choose how many UUIDs you need.
Set the format options.
Click Generate and copy the list.

Use cases

Seeding test data
Creating unique IDs for records and requests
Generating correlation IDs for logs

Frequently Asked Questions (FAQ)

Can two UUIDs collide?+

With random v4 UUIDs the chance is so small that it is ignored in practice.

What is the difference between UUID and GUID?+

GUID is Microsoft's name for the same thing.

Are these safe to use as secrets?+

UUIDs are unique, not secret. Use a dedicated token generator for secrets.

Are the UUIDs stored anywhere?+

No. They are generated in your browser and not sent anywhere.