loot.tools

UUID Generator

Generate UUIDv4 identifiers in the browser, one at a time or in bulk. Toggle uppercase and hyphens, then copy the whole batch at once. Use them for testing, mock data, and unique keys.
Security

Generate UUID v4 identifiers in the browser. Each value comes from a cryptographically secure random source. Nothing is stored or sent anywhere.

Output
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in five groups separated by hyphens, like 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are randomly generated with a collision probability so low you can treat it as zero. Developers use them as primary keys, session tokens, and unique IDs without a central authority.
How this generator works
Pick how many UUIDs you want (1 to 500), then hit generate. Each value uses your browser's cryptographically secure random number generator (crypto.getRandomValues). Switch on uppercase or drop the hyphens to match the format your code expects, and copy the whole batch with one click. Nothing is stored or sent anywhere.
Common use cases
  • Database primary keys when you don't want sequential IDs
  • Generating test data for development
  • Correlation IDs for distributed tracing
  • Unique filenames for uploads
  • Idempotency keys for API requests