Developer tool

UUID / GUID generator

Unique IDs for database rows, files, API requests and test data. Make one, or a thousand.

Version

v4 (random)v7 (time-ordered)

How many

UPPERCASE No hyphens Wrap in { } (Windows GUID style) As a list for code ("…",)

UUIDs

v4 or v7?

v4 is 122 random bits. It's the most common kind and works everywhere.
v7 starts with the current time in milliseconds, then random bits. IDs made later sort after earlier ones, which keeps database indexes fast. It's the newer standard (RFC 9562).

Can two UUIDs ever be the same?

In practice, no. You would need to make billions every second for many years before a repeat became likely.

Is a UUID the same as a GUID?

Yes. GUID is Microsoft's name for the same thing.

Are these safe to use as secret tokens?

v4 IDs here use your browser's secure random generator, but a UUID is meant to be unique, not secret. For passwords and API keys, use the password generator.