Random UUID Generator (v4)
Generate cryptographically secure, standard version 4 UUIDs entirely in your browser.
What is a v4 UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems. Version 4 UUIDs are completely random and pseudo-randomly generated.
They are heavily used as primary keys in databases, unique session IDs, and transaction identifiers. The sheer number of possible v4 UUIDs (2122) means the probability of a collision is vanishingly small—you'd need to generate 1 billion UUIDs per second for about 85 years to reach a 50% chance of a single collision.
Is this tool secure?
Yes. This tool uses the native Web Crypto API (`crypto.randomUUID()`) when available, guaranteeing cryptographically secure randomness generated right inside your browser. No data is sent to a server.