How it works
Generate random Version 4 UUIDs.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
1-
?count=CountNumber · Optional · Default: 5
Outputs
1-
resultResultText · Primary output
result contains the calculator’s complete rendered result area, including its visible result cards, tables, charts, and messages.
Generate random and unique identifiers (v4)
Description
The UUID Generator creates “Universally Unique Identifiers”—strings of 36 characters used to identify information in computer systems. This tool specifically generates Version 4 UUIDs, which are randomly generated. The probability of two UUIDs being the same is so astronomically low that they are considered unique forever.
Inputs
- Count: How many UUIDs you want to generate at once (from 1 to 100).
Outputs
- UUID List: A list of formatted unique IDs.
- Copy Buttons: Individual buttons to copy each specific ID to your clipboard instantly.
Chart
- N/A: This tool provides a functional list of unique keys.
“Good to Know”
- Version 4: This is the most common UUID version used today. It is essentially 122 bits of randomness.
- Uniqueness: There are $3.4 \times 10^{38}$ possible UUIDs. To give you an idea of how big that is: if you generated 1 billion UUIDs every second for 100 years, you’d still have a nearly zero chance of a duplicate.
- Primary Keys: Developers use UUIDs as “Primary Keys” in databases because they can be generated anywhere without needing a central authority to ensure they are unique.
Examples
Example 1: Single Key
- Input: Count: 1
- Output:
f47ac10b-58cc-4372-a567-0e02b2c3d479(example)
Example 2: Batch Generation
- Input: Count: 5
- Output: 5 distinct, randomly generated 36-character identifiers.
Example 3: Large Batch
- Input: Count: 50
- Output: A large list of unique IDs suitable for populating test data in a database.