UUID Generator
Generate unique identifiers instantly
Methodology & standardsRuns in your browser
Inputs
Results update liveInterpretation
How UUID Generation works
The UUID Generator creates version 4 universally unique identifiers using cryptographic random number generation. Each UUID is a 128-bit value displayed as 32 hexadecimal digits in a 8-4-4-4-12 pattern.
Example
Key features
A realistic scenario showing how the calculation guides a practical decision.
Formula
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (where 4 indicates version, y is 8, 9, a, or b)
- Generate UUID v4 identifiers
- Bulk generation up to 50 at once
- Toggle uppercase/lowercase format
- Option to include or exclude hyphens
- Copy individual UUIDs or all at once
Watch out
Common mistakes
- UUID v4 uses random or pseudo-random numbers. The probability of generating a duplicate is astronomically low — roughly 1 in 5.3 x 10^36. UUIDs are commonly used as database primary keys, session identifiers, and distributed system identifiers.