Question 1

Do UUIDs leave my device?

Accepted Answer

No. UUIDs are generated locally with a cryptographically secure random source.

Question 2

What is the difference between v4 and v7?

Accepted Answer

v4 is fully random; v7 is time-ordered and embeds a timestamp, making it better suited as a database primary key.

Question 3

How many can I generate at once?

Accepted Answer

Up to 1000 at a time. Copy all at once or download them as a text file.

UUID Generator