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UUID Generator

Generate random UUIDs (v4), one or in bulk, entirely in your browser.

Processed entirely in your browser. Never uploaded to a server.

Set how many UUIDs you need — one, or up to a thousand at once — and generate them locally using the browser's cryptographically secure random number generator.

FAQ

Is a UUID sent anywhere when I generate it?
No. Every UUID here is generated in this browser tab using the Web Crypto API. Nothing is transmitted.
What is a UUID v4?
A 128-bit identifier that's random rather than derived from a timestamp or hardware address (unlike v1) — the version used almost everywhere a unique ID is needed and privacy or unpredictability matters.
How likely is a collision?
For practical purposes, not going to happen: there are about 5.3 x 10^36 possible v4 UUIDs. You'd need to generate roughly a billion per second for about 100 years before a 50% chance of any two matching.
Can I generate more than one at a time?
Yes, up to 1,000 at once — set the count and generate, then copy them all or download as a text file.
How many characters are in a UUID, and why does it have dashes?
36 characters total: 32 hexadecimal digits plus 4 hyphens, grouped 8-4-4-4-12. The hyphens don't encode anything — they exist purely to make the string easier for a human to read. Strip them out (the checkbox above does this) and it's the identical underlying value.
Does this generate UUID v1 or "uuid1"?
No, this generates version 4 (random) UUIDs only. Version 1 UUIDs encode a timestamp and network identifier instead of pure randomness — see UUID v1 vs v4 vs v7 for what each version actually contains and when v1 still gets used.

What actually makes a UUID unique? Read what a UUID is and why they look like that. Why does this generator produce v4, not v1 or v7? See UUID v1 vs v4 vs v7.

Related tools: Password Generator, SHA-256 Hash, Base64 Encode/Decode.