UUID Generator
Create random version-4 UUIDs — one or thousands at a time. Copy or download in a click.
🔒 Runs entirely in your browser — nothing is sent anywhere
1 UUID
About UUIDs
Universally unique identifiers, generated safely on your own device.
1
What is a UUID?
A 128-bit identifier written as 32 hex characters in five groups — like xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. Version 4 UUIDs are almost entirely random.
2
Are they really unique?
With 122 random bits, the odds of two v4 UUIDs colliding are astronomically small — safe to use as database keys, request IDs, file names and more.
3
How this tool works
Each UUID is built from your browser's cryptographically secure random generator (crypto.randomUUID), so the values never leave your machine.
🔒
Private by design. There's no server involved. Every UUID is created locally in your browser — we never see them and nothing is uploaded.
Frequently Asked Questions
What is a version-4 UUID? ▼
A UUID is a 128-bit identifier written as 32 characters in five groups, like
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. Version 4 means it's made almost entirely of random values, so it's easy to generate anywhere without coordination.Are these UUIDs really unique? ▼
For all practical purposes, yes. With 122 random bits the chance of two ever colliding is astronomically small, which is why v4 UUIDs are trusted as database keys, request IDs and file names.
How many can I generate at once? ▼
Anywhere from 1 to 10,000 in a single click. You can then copy them all or download them as a text file.
Can I change the format? ▼
Yes. You can make them uppercase, wrap each one in
{ } braces, or remove the hyphens — handy for matching whatever your code or database expects.Are the UUIDs random and secure? ▼
Each one is built from your browser's cryptographically secure random generator, so the values are high-quality randoms rather than predictable sequences.
Are the generated UUIDs sent anywhere? ▼
No. Every UUID is created locally in your browser — nothing is uploaded and we never see the values you generate.