UUID Generator
Generate one or many random version 4 UUIDs at once, ready to paste into code, a database seed, or test fixtures.
Overview
UUIDs give you a unique identifier without needing a central counter or database round-trip — version 4 UUIDs are generated entirely from random bits, so any two generated independently are, for practical purposes, guaranteed not to collide. That makes them a common choice for primary keys, request IDs, and test data where uniqueness matters but sequential ordering doesn't.
Examples
Single UUID
Count: 1
3f29c1de-8a4b-4e3a-9c2d-1a2b3c4d5e6f
How It Works
- Choose how many UUIDs you need.
- Click Generate.
- Each UUID appears on its own line, ready to copy.
FAQ
No. UUIDs are generated entirely in your browser using the Web Crypto API's cryptographically secure random number generator.
Version 4 UUIDs are randomly generated with enough entropy that collisions are astronomically unlikely, though not mathematically impossible.
Up to 100 per click, to keep the output manageable — run it again for more.
Yes, that's a common use — just be aware UUIDs are larger than auto-incrementing integers and, unlike sequential IDs, don't preserve insertion order, which matters for index performance on very large tables.