UUID Generator
Generate UUIDs (v4) instantly. Bulk generation, copy-to-clipboard.
About UUID Generator
Generate cryptographically secure UUIDs (Universally Unique Identifiers) version 4. Create single or bulk UUIDs, copy to clipboard, and choose your format. No data leaves your browser.
Frequently Asked Questions
What is a UUID?▾
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. The v4 variant uses random numbers, making collisions practically impossible.
What's the difference between UUID and GUID?▾
They're the same thing. UUID is the official standard name (RFC 4122), while GUID (Globally Unique Identifier) is Microsoft's term for the same concept.
Are UUIDs truly unique?▾
For practical purposes, yes. The probability of generating two identical v4 UUIDs is approximately 1 in 5.3 × 10^36. You'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a collision.