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Random Number Generator

Generate truly random numbers in any range. Unique values, multiple numbers, dice, lottery — secure.

Random Number Generator Crypto Secure
Unique values only
Sort ascending
Recent Generations

Why use this Random Number Generator?

There are plenty of situations where you need a random number without manually choosing one. You might be drawing a raffle winner, rolling virtual dice, selecting lottery numbers, or simply using a number to make a decision. A random number generator removes personal choice from the process and gives you a quick result based on the range and options you select.

This tool provides several ways to generate numbers. You can choose a custom range when you need a number between two values, simulate dice rolls for games, draw unique numbers for a raffle or lottery-style selection, or use a coin flip when the result only needs to be heads or tails.

You can also generate multiple numbers at once. Depending on the selected mode, options such as unique values and ascending sorting can help keep the results easier to use. The generator uses the browser's crypto.getRandomValues() API as its randomness source, which is designed for security-sensitive random number generation.

How to use the Random Number Generator

  1. Choose the mode you need: Range, Dice, Lottery, or Coin.
  2. Set the required options. In Range mode, enter the minimum and maximum values. Other modes provide options appropriate to their type.
  3. Select how many results you want to generate, if the chosen mode supports multiple values.
  4. Turn on Unique values when you don't want the same number to appear more than once.
  5. Enable Sort ascending if you want multiple results arranged from the smallest number to the largest.
  6. Click Generate Numbers to create the result. If supported by the tool, you can also press the spacebar to generate another result.
  7. Copy the complete result or select an individual number to copy it separately.

For a simple selection, Range mode is usually enough. If you're working with a board game or tabletop game, Dice mode can simulate different dice types. Lottery mode is useful when every selected value needs to be different, while Coin mode is suitable for two-outcome decisions or repeated heads-or-tails experiments.

An example

Suppose you're organizing a raffle with 500 entries and need to select five different winners. You can use Lottery mode instead of choosing the numbers manually.

  • Mode: Lottery
  • Minimum: 1
  • Maximum: 500
  • Numbers to pick: 5
  • Unique values: Enabled
  • Sort ascending: Enabled

A possible result could be 17, 83, 219, 364, 412. Because unique values are enabled, the same entry number does not appear twice in that selection. You can then copy the numbers for your announcement or keep the generated result as a record of the draw.

Random Number Generator – FAQ

Yes. This tool uses your browser's built-in crypto.getRandomValues() API, which draws from your device's operating system entropy pool — the same source used to generate encryption keys. This is far better than the standard Math.random() function used by many online generators.
Any situation where you need unbiased random numbers: raffles, giveaways, lottery picks, dice rolls for tabletop games, random sampling for statistics, shuffling lists, picking a winner, generating test data, deciding things fairly, and more. Because it's cryptographically secure, it's even suitable for security-sensitive uses.
When enabled, every number in a batch will be different — no duplicates. This is essential for lottery picks, raffles, and drawing winners. If you request more unique numbers than the range allows (say, 10 unique numbers from 1–5), the tool will warn you to reduce the count.
Range lets you set any custom min/max. Dice simulates standard tabletop dice (D4, D6, D8, D10, D12, D20, D100). Lottery is designed for drawing unique numbers (like Powerball or Lotto) — it automatically enforces uniqueness and is ideal for giveaways. Coin flips a virtual coin for heads-or-tails decisions.
In Range and Coin modes, the limit is 100 numbers per batch. In Lottery mode, up to 20. There's no lifetime limit — you can generate thousands of batches without restriction. Just click Generate again as many times as you need.
No. Every number in the range has exactly the same probability of being picked. We use a rejection-sampling technique to ensure no modulo bias, so even edge cases are handled correctly. Statistical tests would confirm uniform distribution.
Yes. When multiple numbers are generated, click any individual number chip to copy just that number to your clipboard. Or use the "Copy Result" button to copy the entire set (comma-separated). You can also click items in the "Recent Generations" list to copy entire past batches.
Completely. Everything runs in your browser. No numbers, ranges, or results are ever sent to a server. There's no logging, no tracking, and no accounts. History is stored only in memory and disappears when you close the tab.
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