Online Random Number Generator - Free & Secure

How does the Random Number Generator work?

Our generator uses cryptographically secure random numbers from the Web Crypto API (crypto.getRandomValues()). Unlike Math.random(), which is pseudorandom and unsuitable for security or statistical purposes, crypto.getRandomValues() provides true entropy from a system source.

All generation happens directly in your browser – no numbers are sent to the server.

Generator Features

Basic Settings

• Minimum and Maximum – set any integer or decimal range
• Number Count – generate 1 to 10,000 numbers at once
• Duplicates – disable number repetition (suitable for draws)
• Sorting – sort results from smallest to largest
• Decimal Numbers – switch to decimal numbers and set precision

Quick Presets

Where are Random Numbers Used?

Games and Entertainment

• Board Games – rolling dice, drawing order
• Decision Making – when you can’t decide
• Quizzes and Contests – random selection of a question or winner
• RPG Games – generating character attributes

Statistics and Science

• Sampling – random selection of a sample from a population
• A/B testing – random assignment to groups
• Monte Carlo Simulation – probability estimation
• Bootstrapping – statistical method for resampling

Computing and Development

• Test Data – generating test values
• Weight Initialization of neural networks
• Random IDs – when UUID is too large
• Gamification – random rewards, loot box mechanics

True vs. Pseudorandom Numbers

Our generator always uses the cryptographically secure variant, so the results are suitable for simulations, statistical calculations, or draws.

Draws Without Repetition

When the “Disable Duplicates” option is checked, the generator ensures that each number in the range appears at most once in the result. This is ideal for:

• Draws – selecting winners without the possibility of the same person winning twice
• Permutations – random rearrangement of elements
• Bingo – drawing numbers without repetition
• Lottery – 6 distinct numbers from the range 1–49

If the requested number count exceeds the range size, the generator will display an error message.

Export Results

Generated numbers can be copied in two formats:

• Comma-separated – 12, 45, 7, 33 – suitable for pasting into spreadsheets (Excel, Google Sheets)
• Line-by-line – each number on a separate line – suitable for text files or script processing

How to Generate Random Numbers in Your Own Code?

JavaScript / TypeScript

// Cryptographically secure random integer in the range [min, max]
function randomInt(min, max) {
  const range = max - min + 1;
  const arr = new Uint32Array(1);
  crypto.getRandomValues(arr);
  return min + (arr[0] % range);
}

// Pseudorandom (fast, but not secure)
const n = Math.floor(Math.random() * (max - min + 1)) + min;

Python

import random
import secrets

# Cryptographically secure
n = secrets.randbelow(max - min + 1) + min

# Pseudorandom (standard library)
n = random.randint(min, max)

# Without repetition
sample = random.sample(range(min, max + 1), count)

PHP

// Cryptographically secure (PHP 7+)
$n = random_int($min, $max);

// Pseudorandom (older approach)
$n = rand($min, $max);

Frequently Asked Questions (FAQ)