UUID v4 Generator

What is a UUID?

A UUID v4 (Universally Unique Identifier version 4) is a 128-bit identifier used to uniquely identify information in computer systems. It is generated using random numbers, which makes the probability of collisions extremely low, even across different environments.

This tool generates UUIDs in compliance with the RFC4122 standard. UUIDs are popular because they offer a dependable way to create unique identifiers without needing a centralized authority, making them perfect for distributed systems, databases, APIs, and any scenario where uniqueness is critical, regardless of where or when the identifier is generated.

How likely are UUID collisions?

There are 2¹²² possible UUIDs, which is roughly 5.3 undecillion. For there to be a 50% chance of a collision, about 2.71 quintillion UUIDs would need to be generated—this is comparable to creating 1 billion UUIDs per second for 86 years.

Due to the enormous size of the UUID space (128 bits), collisions are extremely unlikely, making UUID v4 effectively unique for most practical purposes.