UUID Generator

Generate cryptographically random UUID v4 or time-ordered UUID v7 values in bulk, and inspect any UUID's version, variant and embedded timestamp.

Runs locally · nothing uploaded

The UUID Generator runs entirely in your browser, so it needs JavaScript. Turn JavaScript on to use it; the guide and FAQs below are available either way.

How to use the UUID Generator

1
Pick v4 (random) or v7 (time-ordered).
2
Set how many you need (up to 1,000), and choose uppercase or no hyphens if required.
3
Copy or download the list. Paste any UUID into the inspector to see its version and timestamp.

What happens to your data

UUIDs are generated in your browser and are never sent to a server.

Frequently asked questions

Should I use UUID v4 or v7?

v7 starts with a millisecond timestamp, so values sort by creation time, which keeps database indexes efficient. v4 is fully random and reveals nothing about when it was made.

Are these UUIDs secure?

They are generated with crypto.getRandomValues, the browser's cryptographically secure random number generator.