UUID Generator

Free UUID Generator (v4)

This free online UUID generator creates cryptographically random RFC 4122 version 4 UUIDs in bulk — up to 1,000 at a time. Choose uppercase, strip the hyphens, or wrap each value in braces, then copy the whole list or download it as a .txt file. It’s free, instant and runs entirely in your browser, so no identifier you create is ever sent to a server.

How to use the UUID generator

1. Enter how many UUIDs you need (between 1 and 1,000).
2. Tick any options you want: Uppercase, Remove hyphens or Wrap in braces.
3. Click Generate — a fresh set of random UUIDs appears instantly.
4. Use Copy all to copy the list, or Download .txt to save it as a file.

What is a UUID / GUID?

A UUID (Universally Unique Identifier), also called a GUID on Microsoft platforms, is a 128-bit value written as 32 hexadecimal digits in the familiar 8-4-4-4-12 pattern, for example 3f2504e0-4f89-41d3-9a0c-0305e82c3301. Its job is to be unique without any central authority handing out numbers — any machine can mint one independently and trust that it will not clash with identifiers created elsewhere.

A version 4 UUID is built almost entirely from random bits: 122 of the 128 bits come from a random source, with the remaining bits fixed to mark the version (the 4) and the variant. Because there are about 5.3 × 10³⁶ possible v4 values, the chance of two randomly generated UUIDs colliding is so small it is treated as negligible in practice. This generator draws its randomness from your browser’s secure crypto API rather than a predictable pseudo-random function, which makes the output suitable for real-world use. Common uses include primary keys in databases, distributed system identifiers, file and object names, idempotency keys for safely retrying API requests, session tokens and message IDs.

Frequently asked questions