Random Number Generator
Generate one or more random numbers within a custom range with support for integers, decimals, unique values and sorted results.
Random Number Generator
Configure the numeric range and generation options.
Number Range
The maximum must be greater than or equal to the minimum.
Choose between 0 and 12 digits after the decimal point.
Generate between 1 and 10,000 values at a time.
Sorting changes only the display order after generation.
Current Configuration
Minimum
1
Maximum
100
Type
Integer
Quantity
1
Unique Values
Off
Possible Values
100
Generated Numbers
Generate values using the configuration beside this panel.
Ctrl/Cmd + Enter can also generate a new set.
Random Result
Ready to Generate
Configure the generator, then use the button directly above. Your numbers will appear in this same panel.
Result Statistics
Summary values calculated from the most recently generated set.
Generated
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Lowest
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Highest
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Average
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How the Random Number Generator Works
Set the Range
Choose the lowest and highest values that may be generated.
Configure the Output
Choose integers or decimals, quantity, uniqueness and result order.
Generate
The results appear directly below the Generate button in the results panel.
Integer Mode Includes Both Boundaries
When generating integers, both the minimum and maximum whole numbers are eligible for selection.
A range from 1 to 100 therefore contains exactly 100 possible integer values.
Decimal Generation Uses Fixed Precision
Decimal values are generated according to the number of decimal places you select.
For example, the range 0.00 to 1.00 at two decimal places contains 101 representable values, including both 0.00 and 1.00.
Unique Values Must Fit Inside the Range
Unique mode prevents a generated value from appearing more than once in the same result set.
If you request ten unique integers from the range 1 to 5, generation cannot succeed because only five distinct integers exist.
Sorting Does Not Change the Random Draw
Ascending and descending modes sort values only after they have been generated.
The selected numbers are generated first, so choosing a sort order does not change which values are eligible.
Random Number Examples
1 to 100
Generate one ordinary random integer between 1 and 100.
5 Unique Numbers
Generate five different integers from a larger range.
Decimal Values
Generate values such as 0.42, 3.75 or 9.10.
Negative Range
Generate numbers entirely below zero or across zero.
Popular Uses
Games
Generate random scores, positions, challenges or game values.
Classroom Activities
Select random questions, numbers, page references or exercise values.
Test Data
Create quick numeric values for development, spreadsheets or demonstrations.
Informal Draws
Generate random ticket or participant numbers for low-stakes activities.
Simulations
Produce repeated random values for simple experiments and demonstrations.
Everyday Decisions
Choose a number when you simply need an unbiased numeric selection.
Private Browser-Based Number Generation
Random number generation happens directly inside your browser during normal use.
- Your configured range does not need to be sent to SwiftVecto.
- Generated values are created locally in the browser.
- No file upload is required.
- No account is required.
General Randomization, Not Certified Lottery Software
This generator is suitable for everyday choices, education, games, testing and informal randomization.
It should not replace independently audited systems where regulated gambling, formal lotteries, cryptographic keys or legally controlled draws require certified procedures.
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How to Use the Random Number Generator
Use the SwiftVecto Random Number Generator to create one or more random integers or decimal values inside a custom numeric range. You can generate unique values, control decimal precision and optionally sort the results.
Overview
The Random Number Generator selects numeric values between a minimum and maximum value directly inside the browser. It can generate integers or decimal numbers, produce a single result or a list, and optionally avoid duplicate values where the chosen range allows it. For integer generation, every available integer in the configured range receives equal selection probability. Decimal generation uses browser-generated random values and rounds them to the selected number of decimal places.
Benefits
How It Works
Enter the minimum allowed value.
Enter the maximum allowed value.
Choose whether the output should contain integers or decimals.
Choose how many numbers should be generated.
For decimal mode, choose the required decimal places.
Choose whether generated values must be unique.
Choose the preferred output ordering.
Press Generate Numbers.
The browser generates values from the configured numeric range.
The results are displayed immediately and can be copied.
How to Use This Tool
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1Enter the minimum value.
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2Enter the maximum value.
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3Choose Integer or Decimal.
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4Choose how many values to generate.
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5Choose decimal places when Decimal mode is selected.
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6Enable Unique Values if repeated numbers should not appear.
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7Choose Random, Ascending or Descending output order.
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8Press Generate Numbers.
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9Review the generated results.
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10Copy the result list if required.
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11Generate again for a fresh set.
Helpful Tips
- The maximum value must be greater than or equal to the minimum value.
- For integer generation, unique mode cannot generate more values than exist in the range.
- For example, the range 1 to 10 contains only ten unique integers.
- Use decimal mode when fractional values are required.
- Increasing decimal places increases the number of representable decimal results.
- Sorting the output does not change which numbers were selected.
- Leave sorting disabled when the original random order matters.
- Negative minimum values are supported.
- Zero can be included in the range.
- Use a sensible quantity when generating very large lists.
- Generated values should not be treated as independently audited lottery results.
- For cryptographic key generation, use purpose-built cryptographic tooling rather than a general random number utility.
Common Uses
Generate one number between 1 and 100.
Generate five unique integers between 1 and 50.
Generate ten decimal values between 0 and 1.
Generate random values between -100 and 100.
Generate six random numbers for an informal game.
Generate test values for a spreadsheet.
Generate random scores.
Generate random positions.
Generate random quantities.
Generate ascending unique integers from a random draw.
Worked Examples
The following examples demonstrate how this tool can be used in realistic scenarios.
One Number Between 1 and 100
Set the minimum to 1, maximum to 100, type to Integer and quantity to 1. The tool will return one integer from the configured range.
Five Unique Numbers
Set the range to 1 through 50, quantity to five and enable Unique Values. Five different integers will be selected from the range.
Decimal Values Between 0 and 1
Choose Decimal mode, set the range from 0 to 1 and select the required decimal precision, such as four decimal places.
Random Negative Numbers
Use a minimum such as -50 and a maximum such as -1 to generate numbers entirely below zero.
Common Mistakes
Avoid these common mistakes to achieve the most accurate results.
- Entering a maximum value below the minimum value.
- Requesting more unique integers than exist in the selected range.
- Expecting integer mode to produce fractional values.
- Expecting decimal rounding to provide infinite precision.
- Confusing sorted output with non-random selection.
- Assuming unique mode means future generations cannot repeat earlier results.
- Using a general random number generator for cryptographic passwords or encryption keys.
- Using informal random numbers for regulated gambling or legally audited lottery systems.
Glossary
Definitions of the most important terms used by this tool.
Random Number Generator
A tool that produces numeric values selected unpredictably from a configured range.
Minimum
The lowest value permitted in the configured numeric range.
Maximum
The highest value permitted in the configured numeric range.
Integer
A whole number without a fractional component, such as -4, 0 or 25.
Decimal
A number that may contain a fractional component, such as 3.14 or 0.75.
Decimal Places
The number of digits displayed after the decimal separator.
Unique Values
A setting that prevents the same generated result from appearing more than once within the same generation.
Uniform Distribution
A model where every permitted value or interval has equal probability according to the generator design.
RNG
An abbreviation for Random Number Generator.
Frequently Asked Questions
What is a random number generator?
A random number generator produces numeric values selected from a specified range using a random process.
Can I generate a number between 1 and 100?
Yes. Set the minimum to 1, maximum to 100 and quantity to 1.
Can I generate several numbers at once?
Yes. Choose the number of results you want to generate.
Can I generate unique random numbers?
Yes. Enable Unique Values when repeated results should not appear within the same generation.
Can I generate decimal numbers?
Yes. Choose Decimal mode and select the desired number of decimal places.
Can I generate negative numbers?
Yes. The minimum and maximum values can be negative.
Can zero be generated?
Yes, if zero falls inside the selected range.
Are the minimum and maximum included?
Integer generation is designed to include both configured boundaries. Decimal generation is constrained to the configured range and may include rounded boundary values.
What happens if I request too many unique integers?
The tool should prevent generation when the requested quantity exceeds the number of available integer values in the range.
Can I sort the generated numbers?
Yes. Results can remain in random order or be sorted ascending or descending.
Does sorting make the results less random?
No. Sorting changes only how already generated results are displayed.
Can I use this for lottery numbers?
It may be useful for informal games, but regulated lotteries or audited draws may require certified systems and specific procedures.
Is this suitable for passwords or encryption keys?
No. Use dedicated cryptographic password, token or key-generation tools for security-sensitive applications.
Does SwiftVecto upload my settings or results?
The Random Number Generator is designed to perform normal generation directly inside your browser.
Is the Random Number Generator free?
Yes. SwiftVecto provides the Random Number Generator as a free browser-based utility.
Things to Know
- The Random Number Generator is designed as a browser-only interactive tool.
- No queue processing is required.
- No file upload is required.
- Integer mode should include both the configured minimum and maximum values.
- Unique integer mode must validate that enough possible values exist in the selected range.
- Decimal generation should respect the configured decimal-place precision.
- Sorting should happen only after random values have been generated.
- The JavaScript module should export init() so SwiftVecto can lazy-load it only when this tool is opened.
Disclaimer
The Random Number Generator is intended for everyday, educational, testing and informal randomization.
It should not be treated as independently audited lottery software.
It is not a substitute for dedicated cryptographic key-generation tooling.
Rounded decimal output may reduce the number of distinct representable values.
Users are responsible for ensuring that the randomization method is suitable for their use case.
Official References
The following official resources were used when developing this tool and are useful for further reading.