UUID Generator

The UUID Generator produces RFC 4122 version 4 universally unique identifiers. A UUID (also called GUID on Microsoft platforms) is a 128-bit value represented as 32 hexadecimal digits grouped as 8-4-4-4-12, for example: f47ac10b-58cc-4372-a567-0e02b2c3d479. Version 4 UUIDs use random bits (except for fixed version and variant markers), which means the chance of two generated UUIDs colliding is astronomically small — roughly 1 in 5×10^36.

UUIDs are the workhorse identifier of modern distributed systems. They are used as database primary keys (especially in systems that generate IDs across multiple servers or offline clients), as correlation IDs in microservice request tracing, as file names to avoid collisions, as session tokens, as document IDs in NoSQL stores, and as feature flags in experimentation platforms. Because they are globally unique without a central coordinator, they sidestep the scaling problems of auto-incrementing integers.

This generator uses window.crypto.getRandomValues for the random bits, the same cryptographically secure source used for password generation. That makes the output suitable for security-sensitive contexts where predictable IDs would be exploitable.

You can generate a single UUID or up to 1000 in one go, with an option to strip hyphens (producing a compact 32-character hex string). Each generation is independent, so you can click repeatedly for fresh batches. Everything runs locally; no UUIDs are transmitted or stored.