UUID Generator — free v4 UUIDs in your browser
Create cryptographically random version 4 UUIDs — instantly, with one click.
This tool runs entirely in your browser. Your files are never uploaded — they stay on your device.
Choose a count and generate up to 50 UUIDs at once.
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to label database rows, API keys, files and anything else that needs a unique name. This tool produces version 4 UUIDs, which are filled almost entirely with random bits.
Generation happens entirely in your browser using the built-in Web Crypto API, so the random values are generated on your device and nothing is ever sent to a server. Choose how many you need, regenerate as often as you like, and copy them individually or all at once.
How to use UUID Generator
- Choose how many UUIDs you want to generate (1 to 50).
- Click "Generate UUIDs" to create the list.
- Copy a single UUID with its copy button, or use "Copy all" to grab the whole list.
- Click "Regenerate" any time you need a fresh set.
Frequently asked questions
What version of UUID does this generate?
Version 4 (random) UUIDs. These are generated from random data, with the version and variant bits set according to the RFC 4122 / RFC 9562 standard.
Are the UUIDs generated on a server?
No. They are created locally in your browser using the native crypto.randomUUID() Web Crypto function. Nothing is uploaded and the values never leave your device.
How random and unique are they?
Version 4 UUIDs use a cryptographically strong random source and contain 122 random bits, so the chance of two ever colliding is vanishingly small for any practical use.
Can I generate more than one at a time?
Yes. Set the count up to 50 to generate a batch in one click, then copy them all together or one by one.