How to use
- Enter how many UUIDs you need.
- Optionally choose uppercase, no hyphens or curly braces.
- Click “Generate” and copy or download the list.
What is a UUID?
A UUID (Universally Unique Identifier, called GUID by Microsoft) is a 128-bit identifier such as 3f2b8c1e-9a4d-4e7b-b1c2-5d6e7f8a9b0c. It's used as a unique key in databases, APIs and distributed systems.
Version 4 is based on random numbers. The chance of generating two identical UUIDs is practically zero.
Frequently asked questions
Are the UUIDs truly random?
Yes. They are generated with your browser's cryptographically secure random number generator (Web Crypto API).
What's the difference between UUID and GUID?
Technically none – GUID is Microsoft's name for the same format.
Can two UUIDs be identical?
In theory yes, in practice no. You'd have to generate billions of UUIDs per second for many years to make a collision likely.