BYTETOOLS

Random Number Generator

Generate random numbers in any range with cryptographically secure randomness. Multiple numbers, no-repeat mode, sorting, plus dice and coin presets.

What is the Random Number Generator?

The ByteTools Random Number Generator picks unbiased random integers in any range you choose, powered by the browser's cryptographically secure random source (crypto.

  • Cryptographically secure, unbiased random integers
  • Any inclusive range, positive or negative
  • Generate up to 1,000 numbers at once
  • No-duplicates mode for draws and raffles
  • Optional ascending sort and one-click copy
  • Dice roll and coin flip quick presets

How to use the Random Number Generator

  1. 1

    Enter the minimum and maximum of your range (both inclusive).

  2. 2

    Choose how many numbers to generate.

  3. 3

    Untick "Allow duplicates" for a raffle-style draw without repeats, and tick Sort if you want ordered output.

  4. 4

    Click Generate, or use the Dice / Coin presets, then copy the results.

About the Random Number Generator

The ByteTools Random Number Generator picks unbiased random integers in any range you choose, powered by the browser's cryptographically secure random source (crypto.getRandomValues) rather than the weaker Math.random(). Generate one number or hundreds at a time.

Options cover the common real-world jobs: disallow duplicates for raffles, prize draws and lottery-style picks; sort the results for readability; and use the one-click dice and coin presets for quick games and decisions. Results can be copied as a comma-separated list.

Everything runs locally in your browser, so draws are instant, free and private — nothing about your ranges or results is sent anywhere, making it suitable for classroom picks, giveaways and sampling.

Frequently asked questions

Are online random number generators truly random?

This tool uses crypto.getRandomValues, a cryptographically secure generator seeded by your operating system's entropy pool — unpredictable enough for security use, unlike Math.random(). For everyday draws, games and sampling it is effectively true random.

How do I pick a random winner for a giveaway?

Number your entrants 1 to N, set the range to 1–N with count 1, and click Generate. For multiple winners, set the count and untick "Allow duplicates" so the same entrant cannot win twice.

Is the generator biased toward certain numbers?

No. It uses rejection sampling, which discards random values that would cause the classic modulo bias, so every number in your range has exactly the same probability of being drawn.

Can I generate random numbers without repeats?

Yes — untick "Allow duplicates". Each result is then unique, like drawing numbered balls from a bag. The count cannot exceed the amount of distinct numbers in the range, and the tool tells you if it does.

What is the difference between this and Math.random()?

Math.random() is a fast pseudo-random generator whose output can be predicted if its internal state leaks, and it was never designed for fairness-critical use. crypto.getRandomValues draws from OS-level entropy and is the standard recommended for anything where unpredictability matters.

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