UUID Generator
Generate version 4 (random) UUIDs instantly in your browser. Bulk generate up to 100 at a time, with options for uppercase and hyphen formatting.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What is a version 4 UUID?
Version 4 UUIDs are generated using random (or pseudo-random) numbers. 122 of the 128 bits are random; the remaining 6 bits are fixed to indicate the version and variant. They require no coordination between systems, making them ideal for distributed applications.
Are these UUIDs truly unique?
The probability of generating two identical v4 UUIDs is astronomically small — roughly 1 in 5.3 × 10³⁶. For all practical purposes they are unique, and this tool uses the browser's cryptographically secure random number generator (crypto.randomUUID) where available.