UUID Generator
Choose a quantity and generate version 4 UUIDs instantly, right in your browser.
Not sure? Turn your internet off and try — it still works.
How it works
A UUID (Universally Unique Identifier) is a 128-bit identifier used to name resources in a practically unique way, without needing a central authority to coordinate the generated values. Version 4 is generated almost entirely from random numbers: the chance of a collision between two independently generated v4 UUIDs is so low it's safe to treat them as unique in practice. They're commonly used as a database primary key, session identifier, temporary file name, or transaction identifier. Generation uses crypto.randomUUID() when available in the browser, with a crypto.getRandomValues()-based fallback for older browsers.