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Random Number Generator

Generate cryptographically random integers or decimals in any range. No patterns, no predictability.

Generator Tools Runs locally No data sent
random crypto generate numbers
Range
Min must be less than Max
Count
1100
10
Type
Options
No duplicates
Sort results
Results

Click Generate to create random numbers

What is a Random Number Generator?

A random number generator produces values that cannot be predicted in advance. This tool uses the browser's crypto API for secure randomness and supports single numbers, unique lists, dice rolls, and coin flips.

How to Use the Random Number Generator

  1. Use Numbers mode to choose a minimum, maximum, and output count.
  2. Switch to List mode to shuffle entries or pick a random subset.
  3. Open Dice & Coin mode to roll common dice types or flip coins.
  4. Copy the result you need directly from the output panel.

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Understand Random Numbers (examples, use cases & FAQs) ▾
Example
Input Numbers mode —Min: 1, Max: 100 →Result: 42
Output List mode —Min: 1, Max: 49, Count: 6 →Result: 3, 17, 22, 35, 41, 48 (6 unique lottery numbers)
Common Use Cases
  • Pick a winner from a list of entries by generating a random index
  • Generate lottery or raffle numbers with no repeats
  • Roll dice for tabletop RPGs (D&D, Pathfinder) without physical dice
  • Create randomized test data ranges for software development
  • Flip a coin to make a quick decision
Why Use This Random Number Generator
  • Uses crypto.getRandomValues() instead of predictable Math.random() output.
  • Combines single-number, list, dice, and coin workflows in one page.
  • Can generate duplicate-free ranges for raffles, sampling, and test data.
  • Runs entirely in the browser, so nothing is logged or uploaded.
Frequently Asked Questions
Is this truly random or pseudo-random?

This tool uses crypto.getRandomValues() , which is a cryptographically secure pseudo-random number generator (CSPRNG) seeded from OS-level entropy. For all practical purposes it is indistinguishable from True randomness and is suitable for security-sensitive tasks.

Can I generate the same number twice in list mode?

No. List mode generates a set of unique numbers —each value appears at most once. If you need duplicates allowed, use the single-number mode multiple times.

What is the maximum range I can use?

The minimum and maximum values can be any integers within JavaScript's safe integer range (±2 53 ). For list mode, the count must be less than or equal to the size of the range.

What does Random Number Generator Online —Free & Customizable do?

Random Number Generator Online —Free & Customizable runs entirely in your browser and helps you complete this task without uploading data to a server.