Utilities
UUID options UUIDs
Generate UUID v1, v4, and v5 values in common formats.
About UUID Generator
Generate v1, v4, or v5 UUIDs in bulk, with optional uppercase or no-dash formatting. v4 is random and the default for primary keys; v1 is time-based; v5 is deterministic from a namespace and a name.
Frequently asked questions
Can two v4 UUIDs ever collide?
Mathematically yes, but at 122 random bits you'd need to generate a billion UUIDs per second for a hundred years to hit a 50% chance of one collision.
When should I use v5 instead of v4?
When you need the same input to always produce the same UUID, for example deriving a stable ID from a user email or a file path.