About UUID Generator
Generate random UUIDs (v4) with customizable formats. Includes UUID validator with version detection.
Frequently Asked Questions
What is a UUID?
UUID stands for Universally Unique Identifier. It is a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across space and time.
What is the difference between UUID versions?
UUID v1 uses timestamp and MAC address, v4 is randomly generated (most common), v5 uses namespace and name with SHA-1 hashing. V4 is recommended for most use cases.
Can two UUIDs be the same?
While theoretically possible, the probability of generating duplicate v4 UUIDs is astronomically low - about 1 in 2^122. For practical purposes, UUIDs can be considered unique.
Are UUIDs case-sensitive?
No, UUIDs are not case-sensitive. "550e8400-e29b-41d4-a716-446655440000" and "550E8400-E29B-41D4-A716-446655440000" represent the same UUID.