UUID Generator
Generate one or many version-4 UUIDs / GUIDs instantly.
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier written as 32 hexadecimal digits, usually grouped into five sections like 3fa85f64-5717-4562-b3fc-2c963f66afa6. This generator produces version-4 UUIDs, which are built from random bits rather than a timestamp or hardware address, using the same secure random source as the Password Generator on this site.
How to use it
- Choose how many UUIDs you need (up to 100 at once).
- Pick uppercase or lowercase letters, and whether to keep the hyphens or wrap each ID in curly braces.
- Click Generate UUIDs and copy the full list.
Developers use UUIDs as primary keys in databases, as unique identifiers for API requests and log entries, and as session or transaction IDs, because the odds of two version-4 UUIDs colliding are astronomically small — effectively zero for any realistic system size. Unlike auto-incrementing integer IDs, UUIDs can be generated independently on different machines without any coordination, which makes them a natural fit for distributed systems and offline-first applications. This generator runs completely client-side, so you can create test data or seed values without a network request or an account.