Free UUID Generator

Generate random version-4 UUIDs (GUIDs) — one or many at a time.

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  • 🔒 Files never leave your device
  • ⚡ Converted in your browser
  • ✅ No account required

UUID Generator: The Complete Guide

Generate cryptographically-random version-4 UUIDs (GUIDs) instantly. Create a single ID or up to 100 at once, in lower or upper case — all in your browser.

How to use the UUID Generator

  1. Paste or type your code, text, or data into the input box.
  2. Adjust options such as indent size, dialect, or flags when the tool offers them.
  3. The output updates instantly — copy it to your clipboard or download the file.

Features

  • Cryptographically-random UUID v4
  • Generate 1–100 at once
  • Upper or lower case
  • Copy or download the result

Why use this tool

  • Unique IDs for databases & APIs
  • No collisions, no coordination needed
  • Bulk-generate for seeding & testing

What is a UUID?

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier designed to be unique across space and time without a central authority. Version 4 UUIDs are random, making them ideal as primary keys, request IDs, and resource identifiers in distributed systems. This tool uses your browser's cryptographically-secure random generator.

Frequently Asked Questions

Which UUID version does this generate?

Version 4 (random) UUIDs, the most common type, generated with your browser's cryptographically-secure randomness.

Are these UUIDs guaranteed unique?

Collisions are astronomically unlikely — v4 UUIDs draw from 122 random bits, so for practical purposes each one is unique.

Is it free and private?

Yes — it's 100% free with no signup, and everything runs locally in your browser, so your data is never uploaded to a server.

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