UUID Generator
Generate random UUIDs (v4) in one click for test data, database records or request IDs.
This tool runs entirely in your browser; what you enter is never sent to our servers.
How to use it
- Enter how many UUIDs you need (1 to 100).
- Optionally pick uppercase or no hyphens, then press “Generate”.
- Copy the whole list with “Copy all”.
How the UUIDs are generated
A UUID is a 128-bit identifier, usually written as 36 characters in an 8-4-4-4-12 pattern. This tool creates version 4 (random) UUIDs: 122 bits come from your browser's cryptographically secure random number generator (crypto.randomUUID), and the remaining 6 bits encode the version and variant. Example: 3f2b9c1e-7a4d-4e8b-9c2f-0d5a6b7c8e91 — the first character of the third group is always 4.