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UUID Generator

Settings
Include hyphens
Uppercase
Wrap with braces
Generated UUIDs

About UUID Generator

Generate RFC 4122 version 4 UUIDs for identifiers and testing. Choose count and output format, then copy in one click.

Runs locally in your browser using crypto‑secure randomness. No data is uploaded.

Common Use Cases

  • Create unique IDs for apps and services
  • Use as database keys or message IDs
  • Name files or resources safely
  • Seed test data and mocks

How It Works

  • Generates UUID v4 with version and variant bits
  • Uses crypto.getRandomValues for secure randomness
  • Optional hyphens, uppercase and braces
  • Copy one or copy all results

FAQ

Are collisions possible?

Extremely unlikely for v4 UUIDs; probability is negligible for typical use.

How many can I generate at once?

Up to 100 in one batch to keep UI responsive.

Is randomness secure?

Yes, uses browser crypto API when available.

Can I change the format?

Toggle hyphens, uppercase and braces in settings.