UUID Generator
Generate random UUIDs (version 4) using your browser's built-in cryptographically secure random number generator. Nothing is sent anywhere.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, usually written as 32 hexadecimal characters in five hyphen-separated groups, designed so that two randomly generated UUIDs are astronomically unlikely to ever collide — no coordination between systems needed. This tool generates version 4 UUIDs, the fully-random variant, using crypto.randomUUID(), your browser's built-in cryptographically secure random number source.
Common uses
- Database primary keys and record IDs
- Unique request or trace IDs for logging and debugging
- Generating test data or placeholder identifiers
Frequently asked questions
What's the chance of two UUIDs colliding?
For version 4 UUIDs, the chance is so small it's not a practical concern — you'd need to generate billions of them before a collision became even remotely likely.
Is my data sent anywhere?
No — every UUID is generated directly in your browser using crypto.randomUUID(), the Web Crypto API's built-in generator.