Add the requested inputs
Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.
Security & privacy · Free online tool
Random number generator
Generate uniform random integers or decimals, with optional unique results.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
Random number generator workspace
Runs locally in your browser
Uses Web Crypto for uniform values. This is not an audited lottery or gambling draw system.
Result
Generation summary—
Random values
Use it with confidence
How to use the random number generator.
Calculate and review
Use the main action when needed. Integers use cryptographic rejection sampling; decimals use cryptographic random bytes mapped to the selected interval.
Try a worked example
Draw five unique integers from 1 to 50, or generate decimal test values within a chosen range.
Check the assumptions
This is useful for draws and test data but is not an audited gambling, lottery or cryptographic key ceremony.
Helpful answers
Random number generator FAQs.
Is the random number generator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this random number generator work?
Integers use cryptographic rejection sampling; decimals use cryptographic random bytes mapped to the selected interval.
What should I check before using the result?
This is useful for draws and test data but is not an audited gambling, lottery or cryptographic key ceremony.