DocomintUUID Generator
Generate RFC 4122 v4 UUIDs instantly in your browser, one or in bulk.
What is a UUID Generator?
A UUID (universally unique identifier) is what you reach for when you need an ID that's guaranteed not to collide with any other ID without a central database assigning them — a new database row, a session token, a request-tracing ID.
How to use the UUID Generator
- Choose how many UUIDs you need
- They're generated instantly using your browser's crypto API
- Copy one or all of them
Example
Generating one v4 UUID returns something like 3fa85f64-5717-4562-b3fc-2c963f66afa6 — 32 hex digits split into five groups, with the version and variant bits fixed by the spec and the rest randomized.
Frequently asked questions
Is my data uploaded anywhere?
No — UUID Generator runs entirely in your browser using JavaScript/WebAssembly. Your data is never sent to a server.
How likely is it that two generated UUIDs collide?
Astronomically unlikely — a v4 UUID has 122 random bits, so you'd need to generate roughly a billion per second for about 85 years before a 50% chance of any collision, per the birthday-paradox math behind the spec.
Is a UUID the same thing as a GUID?
Functionally yes — GUID is Microsoft's name for the same 128-bit identifier format defined by the UUID standard (RFC 4122); the two terms are used interchangeably in practice.