Question 1

What is the difference between UUID v4 and v7?

Accepted Answer

UUID v4 is purely random. UUID v7 embeds a Unix timestamp in the most significant bits, making IDs naturally sortable by creation time — useful for database B-tree indexes.

Question 2

Are generated UUIDs guaranteed to be unique?

Accepted Answer

UUID v4 has 122 random bits, making collisions astronomically unlikely for practical purposes. For critical systems, still enforce uniqueness constraints in your database.

Question 3

Is my data sent to a server?

Accepted Answer

No. UUIDs are generated entirely in your browser using the Web Crypto API. Nothing is transmitted or stored on Zovaty servers.

Question 4

Can I use these UUIDs in production?

Accepted Answer

Yes. Output follows the standard UUID format and is suitable for production databases, APIs, and distributed systems.