Generate random version 4 UUIDs in your browser.
Generate one or more random version 4 UUIDs above. A UUID (universally unique identifier) is a 128-bit value written as 32 hexadecimal digits in five groups, commonly used as a primary key or a correlation id. Version 4 UUIDs are random, so the chance of a collision is negligible in practice.
These are generated with the browser’s `crypto.randomUUID()`, which is cryptographically secure. Nothing is generated or logged on a server.
A version 4 UUID is generated from random numbers rather than a timestamp or MAC address. It has 122 random bits, which makes accidental collisions astronomically unlikely, so it is a safe default for ids that must be unique without coordination.
Yes for uniqueness. Be aware that random UUIDs as primary keys can fragment index locality in some databases; if that matters, consider a time-ordered id (like UUIDv7 or ULID) instead.