About the UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value used as a primary key, correlation ID or unique reference where coordination-free uniqueness matters. Version 4 UUIDs are generated from random data, making collisions astronomically unlikely. This generator uses the Web Crypto API (crypto.randomUUID) so the randomness is cryptographically secure, not a weak Math.random.
Generation is entirely local. Produce a single identifier or a batch of dozens, then copy them in one click — handy for seeding databases, writing tests, or creating sample data.
How to use the UUID Generator
- 1Choose how many UUIDs to generate.
- 2Click Generate.
- 3Copy a single UUID or the whole list.
Key benefits
- Cryptographically secure randomness.
- Generate one or many at once.
- RFC 4122 version 4 compliant.
- Private — generated in your browser.
Real-world examples
Seed a database
Generate a batch of primary keys for test data.
Create a correlation ID
Get a unique ID for tracing a request.
Frequently asked questions
Are these UUIDs unique?+
Version 4 UUIDs have 122 random bits, so the probability of a collision is negligible for any realistic volume.
Is the randomness secure?+
Yes — it uses the browser's cryptographically secure random number generator.