DevToolkit

UUID Generator

Generate secure, cryptographically random Version 4 UUIDs in bulk instantly in your browser.

Generated UUIDs (v4)0 generated
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Features

  • Bulk Generation: Instantly generate up to 10,000 UUIDs at once without crashing your browser.
  • Version 4 UUIDs: Uses cryptographically secure random number generators (crypto.randomUUID()) to guarantee collision-free identifiers.
  • Customizable Format: Easily toggle uppercase formatting or strip out hyphens with a single click.
  • 1-Click Export: Copy your entire list of UUIDs to your clipboard or download them as a .txt file directly to your machine.
  • 100% Secure: Everything is generated locally on your device. We do not track or store the generated strings.

How it works

A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. A UUID v4 is generated using random numbers, making it statistically impossible to generate a duplicate.

This UUID generator relies on your browser's native Web Crypto API to ensure true randomness. Simply set your desired quantity, apply any formatting preferences (such as removing hyphens or making the text uppercase), and click Generate.

Frequently Asked Questions

Everything you need to know about DevToolkit.

What is a UUID used for?

UUIDs are primarily used as primary keys in databases, unique filenames for uploads, or tracking IDs in distributed systems because they can be generated independently without a centralized authority checking for duplicates.

What is the difference between UUID v1 and v4?

UUID v1 uses your computer's MAC address and the current timestamp to generate a unique ID. UUID v4 uses purely random numbers (from a cryptographically secure pseudo-random number generator). V4 is the most widely used version today as it doesn't expose any identifying machine information.

Are these UUIDs really unique?

Yes! A UUID v4 has 122 bits of randomness, meaning there are 2^122 (or 5.3x10^36) possible variations. The chance of generating two identical UUIDs is so infinitely small that you can safely assume every generated ID is globally unique.