Bulk UUID v4 & GUID Generator

Generate thousands of cryptographically secure UUIDs and GUIDs instantly. 100% collision-free and processed safely in your browser.

Introduction

Generate cryptographically secure, perfectly randomized UUIDs (v4) and GUIDs in bulk for your database architectures and test mocks.

What is a UUID Generator and Why Use It?

Universally Unique Identifiers (UUIDs) are 128-bit labels used for information in computer systems. Because they do not require a centralized authority to guarantee uniqueness, they are the standard for database primary keys, session IDs, and microservice architecture routing. Our UUID v4 Generator relies on the browser's cryptographically secure randomness API to ensure absolute collision resistance. Whether you need a single GUID for a config file or 10,000 UUIDs for a database seeder, this tool generates them instantly without any server lag.

Key Features

  • Cryptographically Secure: Powered by the `Crypto.getRandomValues()` API, ensuring true, high-entropy randomness rather than predictable math functions.
  • Bulk Generation: Need sample data? Generate up to 10,000 UUIDs instantly in a single click.
  • Custom Formatting: Easily toggle hyphens, brackets, or uppercase/lowercase formatting to match Microsoft GUID or standard RFC 4122 styles.
  • 100% Client-Side: Since the generation happens locally, there is zero network latency and complete privacy for your identifiers.

How to Generate UUIDs (Step-by-Step)

  1. Step 1: Select the quantity of UUIDs you want to generate (e.g., 1, 100, or 10,000).
  2. Step 2: Check any formatting options, such as stripping hyphens or generating uppercase strings.
  3. Step 3: Click "Generate" and immediately copy the list or download it as a text file for your database.

Frequently Asked Questions

While mathematically possible, the probability of a UUID v4 collision is practically zero. You would need to generate 1 billion UUIDs every second for 85 years to reach a 50% chance of a single duplicate.

There is no practical difference. GUID (Globally Unique Identifier) is simply Microsoft's implementation and terminology for the standard UUID RFC 4122 specification.

No. DevToolbox generates these IDs strictly within your browser. We have no backend logging for generated identifiers.