UUID v7 Generator

A UUID v7 is a 128-bit identifier that encodes the creation time (a millisecond Unix timestamp) in its first 48 bits and fills the rest randomly. That keeps values sorted in creation order while still making the chance of two values colliding practically zero, just like UUID v4.

Because values sort chronologically, using them as a database primary key keeps index writes sequential instead of scattering them randomly across the index — which is what happens with fully random UUID v4 and can hurt write performance over time.

The first 48 bits give you a millisecond-precision timestamp, so you get an approximate creation time, but the rest of the value is random and shouldn't be treated as a precise time source. Store the exact time in a separate field if you need it.

Yes. Hyphens are just readability separators, so removing them doesn't change the underlying 32-character hex value.

No. Every UUID is generated on the spot using the browser's cryptographic random generator and is never sent to or stored on a server.