UUID Generator
A free, browser-based converter. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Input
How many
Version-4 UUIDs generated locally with your browser's crypto API.
Output
Enter values to see the result.
Runs entirely in your browser. Your input is not uploaded or stored.
How to use this calculator
- Choose how many UUIDs you need and whether to uppercase them.
- Click Generate and copy the list.
How it works
Generates version-4 (random) UUIDs using your browser's crypto API — they never touch a server.
Worked example
A v4 UUID. e.g. 3f2504e0-4f89-41d3-9a0c-0305e82c3301
Tips
- Runs entirely in your browser. Your input is not uploaded or stored.
Frequently asked questions
Are they unique?
v4 UUIDs are random 122-bit values — collisions are astronomically unlikely.
Privacy?
Runs entirely in your browser. Your input is not uploaded or stored.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.