UUID Generator
Generate version-4 unique identifiers, one or in bulk.
About UUID Generator
A UUID is a 128-bit identifier generated without coordinating with any central server, yet in practice never collides. That property makes it ideal for distributed systems where several servers create records at the same time.
How to use UUID Generator
- 1
Choose how many identifiers you need.
- 2
They generate instantly using cryptographic randomness.
- 3
Copy them all at once or take them individually.
Frequently asked questions
What are the odds of a collision?
Version 4 carries 122 random bits. Reaching a meaningful collision probability would take billions of IDs per second for years — negligible in practice.
UUID or auto-increment for a database primary key?
A UUID lets you create the ID before insert and does not leak your record count. In exchange it takes more space and, if random, slows index performance. For distributed systems the trade is usually worth it.
What is the difference between version 1 and version 4?
Version 1 derives from the timestamp and network card address, so it can leak machine information. Version 4 is fully random and the correct default.