How to Generate Random Numbers Online
Use range, quantity, duplicate, decimal, and export settings to generate useful random numbers for testing, teaching, and simple decisions.
Choose the right range
Write down the smallest and largest valid value first. For a six-sided die simulation that is 1 through 6; for a sample ID range it may be 1000 through 9999. Generate only the quantity you need, then use decimal precision only when fractional values are meaningful.
Control duplicates and ordering
Turn off duplicates when each result must be unique, such as assigning seat numbers or selecting a sample without replacement. Keep duplicates on for repeated trials such as dice simulations. Sorting makes it easier to inspect values before exporting CSV, JSON, or TXT.
Review the result before use
Browser-generated values are useful for ordinary sampling, teaching, and software tests. They are not a physical true-random source or a compliance system for regulated drawings.
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FAQ
When should I turn off duplicates?
Use no-duplicate mode when a value may appear only once in the generated set.
Can I generate decimal values?
Yes. Choose decimal mode and set the precision that your calculation or test requires.
Which export format should I use?
CSV is convenient for spreadsheets, JSON for code, and TXT for simple copy-and-paste lists.