UUID Generator
Generate RFC 4122 version 4 UUIDs using cryptographically secure random numbers.
Generated UUIDs
About UUID v4
A UUID (Universally Unique Identifier) version 4 is a 128-bit randomly-generated identifier. The algorithm uses cryptographically secure random numbers, making the probability of collision astronomically low.
| UUID Version | Generation Method | Collision Risk |
|---|---|---|
| v1 | Timestamp + MAC address | Low (traceable) |
| v3 | MD5 hash of namespace + name | Deterministic |
| v4 | Cryptographic random | ~10⁻¹⁸ per UUID |
| v5 | SHA-1 hash of namespace + name | Deterministic |
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where y is one of 8, 9, a, or b.