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Free Online UUID Generator (v4)

Generate version 4 UUIDs (Universally Unique Identifiers) instantly with our free online tool. Perfect for developers, database administrators, and anyone who needs unique identifiers for their projects.

Try it now: Generate UUIDs instantly with our free online tool!

Why Use Our UUID Generator?

  • Version 4 UUIDs: Cryptographically secure random numbers
  • Multiple Formats: Generate one or multiple UUIDs at once
  • Customization: Toggle between uppercase/lowercase and hyphen formatting
  • One-Click Copy: Copy individual UUIDs or the entire list with a single click
  • No Server-Side Processing: All generation happens in your browser for maximum privacy

How to Use the UUID Generator

  1. Set Your Preferences

    • Choose the number of UUIDs to generate (1-100)
    • Toggle uppercase/lowercase output
    • Choose whether to include hyphens in the output

  2. Generate UUIDs

    • Click the “Generate UUIDs” button
    • Your unique identifiers will appear in the results section

  3. Copy to Clipboard

    • Click the copy icon next to any UUID to copy it
    • Or use the copy button below the results to copy all generated UUIDs

Common Use Cases for UUIDs

Web Development

  • Unique identifiers for database records
  • Session tokens
  • API keys

Application Development

  • Client-side unique IDs
  • File naming
  • Distributed systems

Testing & Debugging

  • Creating test data
  • Mocking API responses
  • Generating sample data

UUID v4 Format

Our generator creates version 4 UUIDs, which are randomly generated and have the following format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

  • 4 indicates version 4 (random)
  • y can be 8, 9, A, or B (variant 1)

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems.

Are the UUIDs really unique?

While theoretically possible, the chance of generating duplicate UUIDs is extremely low (1 in 2^122).

Can I use these UUIDs in production?

Yes, our generator uses the browser’s cryptographically secure random number generator, making it suitable for production use.

Is there an API for this?

Currently, we only provide a web interface. For programmatic access, consider using your programming language’s built-in UUID library.

Last updated: December 2024

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