UUID Generator

Generate UUID v4 random identifiers instantly.

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Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier represented as a 32-character hexadecimal string separated by hyphens, such as 550e8400-e29b-41d4-a716-446655440000. UUID v4 identifiers are generated using random or pseudo-random numbers, making collisions statistically impossible. UUIDs are used throughout software development for database primary keys, API request identifiers, session tokens, distributed system correlation IDs, and any scenario that requires a globally unique value without a central registry. Our free UUID generator uses the browser's built-in crypto.randomUUID() API for cryptographically secure generation. No data is sent to any server.

When to Use UUIDs

  • Generating primary keys for database records without auto-increment conflicts
  • Creating unique request or correlation IDs for distributed systems and microservices
  • Producing session tokens, API keys, or temporary identifiers
  • Assigning unique IDs to files, uploads, or user-generated content
  • Testing and development when you need placeholder unique values
  • Generating idempotency keys for payment or transaction APIs

How It Works

Click the generate button to create a UUID v4 using the Web Crypto API. You can bulk generate up to 100 UUIDs at once, toggle hyphens on or off, and switch between uppercase and lowercase output. Copy a single UUID or all generated UUIDs to your clipboard with one click. All generation happens in your browser with zero server requests.