UUID Generator - Free Online UUID Generator (Universally Unique Identifier)

Click "Generate UUID" to get a unique identifier

What is a UUID Generator?

A UUID Generator is an online tool used to generate Universally Unique Identifiers (UUIDs) or Globally Unique Identifiers (GUIDs). UUIDs are 128-bit numbers that are used to uniquely identify objects, entities, or records across distributed systems, databases, APIs, IoT devices, and software applications. These identifiers are critical in ensuring uniqueness without the need for a central authority to manage them.

Why Use a UUID Generator?

UUIDs are designed to be globally unique, making them perfect for a wide range of applications, including:

  • Database Records: Creating unique primary keys.

  • API Endpoints: Identifying resources in RESTful APIs.

  • Session Tokens: Generating secure session identifiers.

  • Device Identification: Tagging IoT devices.

  • Software Licensing: Generating license keys.

UUID Versions and Their Uses

There are different versions of UUIDs, each serving a unique purpose:

  • UUID v1: Based on timestamp and MAC address. Good for chronological ordering but may expose device information.

  • UUID v4: Randomly generated, highly unique, and widely used. This is the most popular version.

  • UUID v5: Generated using a namespace and a name, creating a consistent but unique identifier.

In most cases, UUID v4 is preferred for its simplicity and strong uniqueness properties.

How UUID v4 Works

UUID v4 is generated using random numbers, ensuring a very low probability of collision, even when generating billions of UUIDs. It has the following structure:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Where:

  • "x" is any random hexadecimal digit (0-9, a-f).

  • "4" indicates the UUID version (v4).

  • "y" is a random hexadecimal digit from 8, 9, a, or b.

Example UUIDs:

a4d8e8b8-3c91-4fda-a2b8-942f53b6b394  
f3c8dba4-88c1-4ed9-b3a5-6f819b9c12d5  
d92efc7c-1b5a-4b6a-9519-2a5f1e8c3e43

Features of the UUID Generator Tool

  • Fast and Secure: Generate UUIDs instantly with a single click.

  • Copy to Clipboard: Quickly copy your generated UUID for use in your projects.

  • Mobile Friendly: Responsive design for use on any device.

  • No Data Storage: No data is stored, ensuring complete privacy.

  • UUID v4 Standard: Generates UUIDs that comply with the v4 specification.

How to Use the UUID Generator

  1. Generate a UUID: Click the "Generate UUID" button.

  2. Copy to Clipboard: Click "Copy to Clipboard" to save the generated UUID.

  3. Use Your UUID: Paste your UUID into your database, API, or application.

Why Choose UUIDs for Your Application?

  • Global Uniqueness: Almost zero chance of duplication, even across billions of identifiers.

  • Decentralized: No need for a central authority to issue IDs.

  • Scalable: Ideal for distributed systems and microservices.

  • Cross-Platform: Supported in almost every programming language, including JavaScript, Python, PHP, Go, C#, and Java.

UUID Generator Example:

Generated UUIDs:

e7d8e4f4-2c3e-4fb1-bf15-9287d1e3a2a6  
5c0f1de6-9c3a-4c1a-90c2-6b89e3e1a2a1  
27e0b7d4-5e4c-456d-bf6f-4f3d3e4a1a5b

Copy and Use:
Simply click "Generate UUID" to create a new UUID, then click "Copy to Clipboard" to use it in your project.

Conclusion

UUIDs are essential for developers building distributed systems, APIs, and databases. They provide a simple yet powerful way to ensure unique identification without central coordination. Our UUID Generator makes it easy to generate secure, random UUIDs online, completely free of charge. Give it a try today!