UUID Generator (v4)
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Formula: RFC 4122 v4 UUID format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
UUID Generator
UUIDs provide globally unique identifiers without a central authority. UUID v4 uses random numbers.
Conversion Formula
RFC 4122 v4 UUID format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Random hex digits fill the UUID template. The "4" marks version 4, and the variant bits are set in the fourth group.
Step-by-Step Examples
1 UUID = e.g. 550e8400-e29b-41d4-a716-446655440000
Random v4 UUID
Frequently Asked Questions
What is a UUID?
A Universally Unique Identifier — a 128-bit number used to identify information in computer systems. Format: 8-4-4-4-12 hex digits.
Can UUIDs collide?
Theoretically yes, but the probability is astronomically low — about 1 in 2^122 for v4 UUIDs.
What is UUID v4?
Version 4 UUIDs are randomly generated. The "4" in the third group and the first digit of the fourth group (8, 9, a, or b) identify the version.