Question 1

What is UUID version 7?

Accepted Answer

RFC 9562 UUID v7 starts with a 48-bit Unix timestamp in milliseconds, then a version nibble of 7, then random bits with the RFC 4122 variant. IDs sort roughly by creation time.

Question 2

When should I use v7 instead of v4?

Accepted Answer

Use v7 for database primary keys and logs where time order helps indexes. Use v4 when you want no embedded timestamp. This page can generate either.

Question 3

Are these cryptographically unique?

Accepted Answer

Random bits come from crypto.getRandomValues. Collisions are extremely unlikely for typical app volumes. This is not a substitute for a coordinated ID service at planetary scale.

Question 4

Can I generate many UUIDs at once?

Accepted Answer

Yes. Set the count up to 500 and click Generate. Copy the list or download a text file, one ID per line.

UUID v7 Generator