HIFreeTools

Free Random Number Generator

Generate random numbers within a range you set. Choose how many to draw, whether to allow duplicates, and whether to sort the results.

Quick answer

A random number generator produces numbers within a range you choose. Set a minimum and maximum, pick how many you want, and decide whether repeats are allowed. This tool draws uniform, unbiased numbers using your browser’s secure random generator.

Formula & method

Numbers are drawn uniformly from your inclusive min–max range using the browser’s Web Crypto API with rejection sampling, which avoids the slight bias a plain modulo would introduce. With duplicates turned off, drawn numbers are removed from the pool so each result is unique (a random selection without replacement).

Examples

Example 1: One number, 1–100
Input
min 1, max 100, count 1
Result
e.g. 57
Why
A single uniform draw from the inclusive range.
Example 2: Lottery-style, no repeats
Input
min 1, max 49, count 6, unique
Result
e.g. 4, 11, 23, 28, 35, 42
Why
Six distinct numbers, like a 6/49 draw.
Example 3: Dice substitute
Input
min 1, max 6, count 1
Result
A number from 1 to 6
Why
Any small range works as a roll.

When to use this tool

  • Picking a winner, a seat, or an order at random.
  • Drawing several unique numbers without replacement.
  • Generating sample data or a quick random pick.

Common mistakes

  • Requesting more unique numbers than the range allows (e.g. 10 unique values from 1–5).
  • Forgetting the range is inclusive of both the minimum and the maximum.
  • Assuming this is suitable for lotteries or gambling — it’s for everyday, fair selection.

Frequently asked questions

＋ How do I generate a random number in a range?

Enter a minimum and maximum, set how many numbers you want, and generate. Results are drawn uniformly from the inclusive range you chose.

＋ Can I avoid duplicate numbers?

Yes. Turn off duplicates to draw unique numbers without replacement — useful for raffles or lottery-style picks.

＋ Are the numbers truly random?

They use the Web Crypto API, a cryptographically secure source, with rejection sampling to keep every value equally likely.

＋ Is the range inclusive?

Yes. Both the minimum and the maximum can be produced.

＋ Does it improve my odds in a lottery?

No. Random numbers can’t predict or improve lottery outcomes. This tool is for everyday fair selection, not gambling.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

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