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UUID Generator

UUID Generator Settings

Number of UUIDs
UUID Version
Uppercase

Generated UUIDs (0)

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About the tool

🔑 UUID Generator – Generate and Copy UUIDs Easily

The UUID Generator is a client-side tool that allows you to generate and copy Universally Unique Identifiers (UUIDs). Whether you're a developer, database administrator, or anyone who needs unique identifiers, this tool makes it easy to create UUIDs without sending any data to a server.

This guide explains what UUIDs are, their different versions, and walks you through using our free online generator to create UUIDs for your projects.

📘 What are UUIDs?

A Universally Unique Identifier (UUID) is a 128-bit identifier that is guaranteed to be unique across space and time. UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE).

UUIDs are typically represented as 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and 4 hyphens):


                xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

For example: f47ac10b-58cc-4372-a567-0e02b2c3d479

🧩 UUID Versions

There are several versions of UUIDs, each generated differently:

  • UUID v1 (Time-based): Generated using the current timestamp and the MAC address of the computer.
  • UUID v4 (Random): Generated using random or pseudo-random numbers. This is the most commonly used version due to its simplicity and lack of privacy concerns.

Our generator primarily focuses on UUID v4, which is suitable for most applications, but also offers UUID v1 as an option.

⚙️ How the UUID Generator Works

Our UUID Generator provides a simple interface to:

  1. Select the number of UUIDs you want to generate (from 1 to 100)
  2. Choose the UUID version (v4 random or v1 timestamp-based)
  3. Generate UUIDs with a single click
  4. Copy individual UUIDs or all at once
  5. Export UUIDs to a text file

🧩 Key Features

  • ⚡ Fast generation of multiple UUIDs at once
  • 🔄 Option to switch between UUID v4 (random) and v1 (timestamp-based)
  • 🔠 Toggle between uppercase and lowercase output
  • 📋 Easy copying of individual UUIDs or all generated UUIDs
  • 💾 Export generated UUIDs to a text file
  • 🔐 Client-side only — all generation happens in your browser
  • 📱 Mobile and desktop-friendly interface
  • 🌓 Light and dark mode support

🔐 Security and Privacy

Our UUID generator runs entirely in your browser using the native crypto.getRandomValues() API for UUID v4, ensuring:

  • No server communication — your data never leaves your device
  • Cryptographically strong random numbers for UUID v4 generation
  • No tracking or logging of generated UUIDs

🔄 Common Uses for UUIDs

UUIDs are widely used in software development and database systems for various purposes:

  • Database primary keys that need to be unique across distributed systems
  • Session identifiers in web applications
  • Transaction IDs in distributed systems
  • File names or identifiers in content management systems
  • Device identification in IoT applications

🔄 How to Use the UUID Generator

  1. Select the number of UUIDs you want to generate using the input field or slider
  2. Choose between UUID v4 (random) or v1 (timestamp-based) if needed
  3. Toggle uppercase/lowercase if you have a preference
  4. Click the "Generate" button to create your UUIDs
  5. Copy individual UUIDs using the copy buttons or copy all at once
  6. Optionally export the generated UUIDs to a text file

Frequently Asked Questions

  • Is the UUID Generator free ?

    Yes, UUID Generator is totally free :)

  • Can i use the UUID Generator offline ?

    Yes, you can install the webapp as PWA.

  • Is it safe to use UUID Generator ?

    Yes, any data related to UUID Generator only stored in your browser(if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

  • What is a UUID?

    A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. UUIDs are typically represented as 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters.

  • What's the difference between UUID v1 and v4?

    UUID v1 is generated based on the current timestamp and the MAC address of the computer, making it time-based. UUID v4 is generated using random or pseudo-random numbers, making it completely random. UUID v4 is more commonly used due to its simplicity and lack of privacy concerns related to exposing MAC addresses.

  • How does this UUID Generator work?

    This UUID Generator uses the browser's native crypto.getRandomValues() API to generate cryptographically strong random values for UUID v4. For UUID v1, it uses a combination of timestamp and random values. All generation happens client-side in your browser, ensuring privacy and security.

  • Is it safe to use these UUIDs?

    Yes, the UUIDs generated by this tool are cryptographically secure (for v4) and follow the UUID standard. They are suitable for most applications requiring unique identifiers. The generation happens entirely in your browser, so your data never leaves your device.

  • How many UUIDs can I generate at once?

    You can generate from 1 to 100 UUIDs at once using this tool. You can also regenerate new UUIDs without reloading the page, and export the generated UUIDs to a text file if needed.