UUID Generator
Generate random UUID v4 identifiers, one at a time or in bulk. Everything happens on your device — nothing is sent anywhere.
What is a UUID v4?
A UUID (Universally Unique Identifier) version 4 is a 128-bit value generated from random bytes, formatted as 32 hex digits in five groups (8-4-4-4-12). Version and variant bits are fixed per RFC 4122, so every value is recognizable as a valid v4 UUID while the rest stays random.
Is it safe to use these as real IDs?
Yes — collisions are astronomically unlikely (about 1 in 2.7×10^38 combinations), and this generator uses your browser's crypto.getRandomValues, the same cryptographic randomness source used by password managers.
Is any data sent to a server?
No. Everything runs locally in your browser with JavaScript. Nothing is uploaded, logged, or stored.