Question 1

How do I generate UUIDs with this tool?

Accepted Answer

Choose the UUID version (v4 or v7), set how many IDs you want, and the tool instantly produces a batch of UUIDs. You can then copy a single value or copy the whole list at once.

Question 2

What is the difference between UUID v4 and v7?

Accepted Answer

v4 is fully random and order-independent, while v7 combines the current timestamp with randomness so the IDs sort roughly in creation order. Pick v7 when you want time-sortable identifiers, and v4 when you just need a random unique value.

Question 3

Which version should I use for database primary keys?

Accepted Answer

v7 is usually the better choice for primary keys because its time-ordered values keep index inserts sequential and reduce fragmentation. Use v4 only when you specifically want no ordering or timing information embedded in the ID.

Question 4

Is this UUID generator free and does it work offline?

Accepted Answer

Yes, it is completely free with no account required, and generation happens entirely in your browser. Once the page has loaded you can keep generating UUIDs even without an internet connection.

Question 5

Are the generated UUIDs sent to a server?

Accepted Answer

No. The UUIDs are created locally in your browser using its built-in randomness, and nothing is uploaded, stored, or tracked. The generated values never leave your device.

UUID Generator

FAQ