Frequently Asked Questions
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The probability of generating the same UUID v4 twice is astronomically small — approximately 1 in 5.3 × 10³⁶.
UUID v1 is generated from the current timestamp and MAC address, making it time-sortable but potentially leaking machine identity. UUID v4 is entirely random using a cryptographically secure RNG, making it the preferred choice for most applications where ordering is not required.
Yes. GUID (Globally Unique Identifier) is Microsoft's term for the same concept. GUIDs follow the same UUID specification and are often written in uppercase with curly braces in Windows and .NET contexts.
Yes. This generator uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically secure random bytes — the same entropy source used by production UUID libraries. The generated UUIDs conform to RFC 4122 version 4.