UUID Generator

A UUID (Universally Unique Identifier) is a 128-bit value designed so that two independently generated IDs are, for all practical purposes, guaranteed never to collide — even across different machines, databases, or services with no coordination between them. That property makes UUIDs the default choice for database primary keys, distributed system trace IDs, idempotency keys, and any identifier that needs to be generated in more than one place without a central counter.

This generator produces version 4 UUIDs, the most common variant, which are built almost entirely from random bits (122 of the 128 bits are random; the rest encode the version and variant). It uses the Web Crypto API's crypto.randomUUID() under the hood, the same cryptographically secure random number generator browsers use for security-sensitive operations, rather than a weaker Math.random()-based implementation that some online generators still use.

You can generate up to 1,000 UUIDs at once, which is useful for seeding test data, pre-generating IDs for a batch import, or quickly grabbing a handful of unique keys while prototyping. Every UUID is generated independently, so there's no shared state or sequence between them.