UUID Generator
Generate unique, random Version 4 UUIDs instantly for your applications.
What is a UUID?
A UUID (Universally Unique Identifier), sometimes referred to as a GUID (Globally Unique Identifier), is a 128-bit number used to uniquely identify information in computer systems. When generated according to standard methods, UUIDs are for practical purposes unique, without depending on a central registration authority or coordination between the parties generating them.
What is a Version 4 UUID?
There are multiple versions of UUIDs, each generated using different algorithms. A Version 4 UUID is entirely randomly generated. Out of the 128 bits, 122 bits are randomly generated, meaning there are 2122 (or 5.3 × 1036) possible v4 UUIDs. This staggering astronomical number practically guarantees that no two v4 UUIDs generated will ever collide or duplicate.
Common Use Cases
UUIDs are extensively used by software developers and database administrators as primary keys in databases, session identifiers in web applications, and transaction IDs in distributed microservices where generating a unique ID quickly without consulting a central database is crucial for performance.