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UUID Generator

Generate RFC 4122 version 4 UUIDs. All generation happens entirely in your browser using the Web Crypto API — your data never leaves your device.

Format Options

Bulk Generation

What is UUID Generator?

UUID Generator creates cryptographically random v4 UUIDs using the Web Crypto API, with support for bulk generation, formatting options (uppercase, hyphens, braces), and a persistent generation history. Version 4 UUIDs are the most widely used variant, offering 122 bits of randomness and a collision probability so low it's effectively zero for any practical workload.

How to Use

  1. Click Generate for a single UUID, or set a count and generate in bulk
  2. Choose your preferred format — uppercase, with or without hyphens, wrapped in braces
  3. Click any UUID to copy it to your clipboard, or download bulk results as a text file

Use Cases

  • Generating unique primary keys for database records during development
  • Creating batches of test data with random identifiers
  • Producing correlation IDs for tracing requests across distributed systems
  • Generating unique keys for configuration files, feature flags, or API tokens

Privacy & Security

All processing happens entirely in your browser using the Web Crypto API for true cryptographic randomness. No data is ever sent to any server, and generated UUIDs are never logged or stored externally. You can verify this by checking the network tab in your browser's developer tools — you'll see zero outbound requests.

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