Generate a UUID
Generate random v4 UUIDs one at a time or in bulk, with optional uppercase and hyphen formatting.
UUIDs are generated on your device. Nothing is ever transmitted.
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Generate in bulk
01
Generate one
A fresh v4 UUID is ready as soon as the page loads. Regenerate anytime.
02
Or generate in bulk
Set a count and get a list, one UUID per line.
03
Copy and use
Copy a single UUID or the whole batch at once.
Frequently asked
Are these UUIDs actually unique?
They're version 4 (random) UUIDs, generated with crypto.randomUUID(). The collision odds are astronomically low, the same guarantee any UUID v4 library gives you.
Is anything sent to a server?
No. Every UUID is generated locally in your browser.
What's the max bulk count?
1,000 per batch. Comfortably enough to seed test data without the textarea becoming unwieldy.
Does this work offline?
Yes, once the page has loaded.