About the UUID Generator
A UUID (Universally Unique Identifier), also known as a GUID in the Microsoft world, is a 128-bit identifier that is practically guaranteed to be unique without needing a central authority. Version 4 UUIDs are generated from random numbers and look like 3f2b8c1e-9d4a-4b7e-8f21-6c5d9e0a1b2c.
Developers use UUIDs as database primary keys, API request IDs, file names, session tokens and test data. This UUID Generator uses your browser's cryptographically secure random number generator and can create up to 5,000 UUIDs at once. Format them in uppercase, without hyphens or wrapped in braces, then copy or download the list.
How to use the UUID Generator
- Enter how many UUIDs you need.
- Choose uppercase, no hyphens or braces formatting.
- Click Generate UUIDs.
- Copy all or download them as a text file.
Frequently asked questions
Can two UUIDs ever be the same?
In theory yes, but the probability is astronomically small. You would need to generate billions of UUIDs per second for many years to expect a single collision.
What is the difference between UUID and GUID?
They are the same thing. GUID is the name Microsoft uses for UUIDs.
Are these UUIDs secure?
They are generated with crypto.getRandomValues or crypto.randomUUID, which are cryptographically secure random sources.