Unique IDs, instantly.
Generate up to 1,000 UUIDs at once — random v4 or sortable v7.
Version
Result
How it works
Version 4 UUIDs are 122 random bits from your browser's secure random generator. Version 7 UUIDs start with a 48-bit millisecond timestamp followed by random bits, so they sort by creation time — handy as database keys.
FAQ
Can two UUIDs ever collide?
In theory yes, in practice no: you would need to generate billions of v4 UUIDs per second for many years before a collision became likely.
Should I use v4 or v7?
Use v7 for database primary keys, because time-ordered values index more efficiently. Use v4 when the ID shouldn't reveal when it was created.