UUID Generator
Generate unique UUIDs
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups: 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are randomly generated with 2^122 possible values, making collisions virtually impossible.
What UUID versions are available?
Version 1: timestamp + MAC address (reveals creation time). Version 4: fully random (most common). Version 5: name-based using SHA-1. Version 7: timestamp-ordered random (newest, sortable). The generator supports all versions.
How likely is a UUID collision?
For UUID v4: generating 1 billion UUIDs per second for 85 years gives a 50% chance of one collision. In practice, the probability is negligible. You would need 2.71 × 10^18 UUIDs for a 50% collision probability.
Can I generate multiple UUIDs at once?
Yes. Generate up to 1,000 UUIDs in a single click. Results are displayed in a list and can be copied to clipboard or downloaded as a text file. Each UUID is guaranteed unique by the random generation algorithm.
What is the difference between UUID and GUID?
They are the same thing. UUID is the standard term (RFC 4122). GUID (Globally Unique Identifier) is Microsoft's term. The format and generation algorithms are identical. Some systems display GUIDs with braces: {550e8400-...}.