Utill.net

UUID Generator

RFC 4122 Version 4

Generate one or many RFC 4122 version 4 UUIDs for database rows, fixtures, filenames, and distributed systems.

What is this tool?

This UUID generator creates RFC 4122 version 4 identifiers. A UUID v4 is a 128-bit identifier whose uniqueness comes from randomness, making it practical for distributed systems that need IDs without a central counter.

The familiar UUID string format is 36 characters with hyphens, such as xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The version and variant bits identify the UUID layout, while the remaining bits are random.

Use UUIDs for database rows, file names, test fixtures, event IDs, queue messages, and distributed traces. Do not use them as passwords or bearer tokens because uniqueness and secrecy are different properties.

How to use

  1. Choose how many UUIDs to create, from 1 to 50.
  2. Click Generate to produce a fresh batch.
  3. Copy one value or the full newline-separated list.
  4. Use UUIDs for uniqueness, not for secrecy.

Related tools & concepts

Last reviewed: 2026-05-08