Generate Random Numbers in Any Range Generate random numbers within a custom range with unique-only option.
Random Number Generator
Generate random numbers within a custom range with unique-only option.
Set Range
Enter minimum and maximum values for your random numbers.
Choose Options
Set quantity and toggle unique-only mode if needed.
Generate
Click Generate to produce random numbers based on your settings.
What Is Random Number Generator?
A Random Number Generator produces random integers within a specified range, allowing users to customize the minimum and maximum values. Developers, data analysts, and researchers use it to generate random numbers for applications such as lotteries, statistical sampling, and game development, where unbiased random selection is crucial. One specific problem it solves is ensuring unique random selections, which is particularly important in simulations or modeling where duplicate values can skew results.
The tool's ability to generate multiple numbers at once, with an option to ensure uniqueness, sets it apart from other number generators. It allows users to specify a quantity of numbers to generate, up to 10,000, and optionally check for uniqueness, which helps prevent duplicates in the output. The code behind it uses a pool of numbers to shuffle and select unique values when this option is enabled, ensuring that the generated numbers are truly random and distinct.
It also features input fields for minimum and maximum values, allowing users to define their own range, such as generating random numbers between 1 and 100. This flexibility makes it a useful Random Number Picker for various applications, including generate random numbers online for simulations or modeling tasks. With its customizable range and unique generation capabilities, the tool provides a reliable way to produce random integers for a wide variety of use cases, from simple random number generator 1 to 100 tasks to more complex statistical analyses.
Why Use Random Number Generator?
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Custom min/max range for any use case
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Generate multiple numbers at once (up to 10,000)
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Unique-only mode prevents duplicates
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Uses Fisher-Yates shuffle for unbiased unique selection
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Clean interface — set range, quantity, and generate in one click
Common Use Cases
Lottery & Raffles
Draw unique winning numbers for lotteries, raffles, or giveaways.
Statistical Sampling
Select random samples from numbered datasets for analysis.
Game Development
Generate random values for dice rolls, card draws, or game mechanics.
Random Selection
Pick random items from a numbered list for surveys or testing.
Technical Guide
Random number generation uses Math.random() for standard use and offers unique mode using the Fisher-Yates shuffle algorithm. For unique numbers, an array of all possible values is created, shuffled, and the first N values are selected. This guarantees unbiased selection without replacement. The Fisher-Yates shuffle iterates backward through the array, swapping each element with a randomly chosen element from the remaining unshuffled portion, producing a uniformly random permutation in O(n) time. The tool validates that the requested quantity doesn't exceed the range size for unique mode.
Tips & Best Practices
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1Use unique mode for lottery-style draws where no number should repeat
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2For dice simulation, set range 1-6 with no unique constraint
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3The range is inclusive on both ends — min and max can both be generated
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4For negative ranges, set min to a negative number
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5Unique mode requires range size ≥ quantity — the tool will warn if not possible
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📝 Text ToolsFrequently Asked Questions
Q Are min and max inclusive?
Q How does unique mode work?
Q Can I generate negative numbers?
Q Is there a limit on quantity?
Q Are the numbers truly random?
About This Tool
Random Number Generator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.