🎲 Random Number Generator

This free random number generator is an all-in-one randomness tool covering four common needs: generating a random number between two numbers you choose, rolling virtual dice, flipping a coin, and shuffling or drawing names from a list. Used online as a random number generator, dice roller, coin flip simulator, and random list shuffler in one place, it's built for anyone who needs an unbiased outcome quickly — teachers picking students with a random name picker, streamers running giveaways with a giveaway winner picker, tabletop gamers who need a d20 roller or d6 dice roller without physical dice, or developers testing with random sample data from a random integer generator.

How It Works

Each tool draws numbers using your browser's crypto.getRandomValues() API when available, which makes this a genuinely secure random number generator that produces cryptographically strong randomness rather than a predictable pseudo-random sequence — falling back to Math.random() only if the browser doesn't support it. The random number generator online maps random values onto your chosen min/max range to give you a random number between two numbers, and can enforce "no repeats" so every unique random number it returns is a number generator no repeats result. Roll a dice online with any standard die (d4 through d100) treating each face as equally likely, or use the coin toss online feature for a quick heads or tails call. List shuffling and "Pick N" use the Fisher–Yates algorithm — the same shuffle list online logic behind the random list shuffler, raffle picker, and RNG online used for drawing names — which guarantees every possible ordering has an equal chance of occurring.

Formula & Worked Examples

The number generator, dice roller, and coin flip all share one range formula: result = Math.floor(random × (max − min + 1)) + min, where "random" is a fraction between 0 and 1 pulled from crypto.getRandomValues() (or Math.random() as the fallback). Here's exactly how each tool applies it:

• Number Generator: with the default range of 1 to 100, the range size is 100 − 1 + 1 = 100. If the secure random source returns a fraction of 0.4128, the result is Math.floor(0.4128 × 100) + 1 = Math.floor(41.28) + 1 = 42 — a random number between two numbers landing squarely inside your chosen min/max range. Generating 5 numbers this way with "No duplicate numbers" checked returns a duplicate-free set such as 7, 23, 42, 58, 91 — a number generator no repeats result you can then sort ascending or descending.
• Dice Roller: rolling the default 2 six-sided dice (d6 dice roller) reuses the same formula with min = 1 and max = 6 per die. A random fraction of 0.62 gives Math.floor(0.62 × 6) + 1 = 4, and a fraction of 0.95 gives Math.floor(0.95 × 6) + 1 = 6, so rolling a dice online this way reports a Total of 4 + 6 = 10 and an Average of 10 ÷ 2 = 5.00 — the same math powers the d20 roller and every other virtual dice option up to d100.
• Coin Flip: each flip calls the same formula as randomInt(0, 1), where 0 means heads and 1 means tails — mathematically a coin toss online is just a 2-sided die roll. Flipping the default 10 coins might land 6 heads and 4 tails on one run and 5 heads/5 tails on the next, since every individual heads or tails call is an independent 50/50 event.
• Shuffle List: pasting the sample names Alice, Bob, Charlie, and Diana and choosing "Shuffle All" runs the Fisher–Yates shuffle, walking the list backward from the last item and swapping each one with a randomly chosen earlier item — a possible result is Charlie, Alice, Diana, Bob. Switching to "Pick N Items" with N = 2 then draws that many names from the shuffled order without repeats, for example Diana and Bob, which is exactly how this random list shuffler doubles as a raffle picker or giveaway winner picker.

Why It Matters

Fair, unpredictable outcomes matter whenever a decision needs to be seen as unbiased — splitting chores with a random number picker, drawing raffle winners with a raffle picker, assigning teams, rolling virtual dice for a board game, settling a call with a coin flip, or generating test data that isn't accidentally patterned. Using a proper randomness source (rather than "just picking one") removes the appearance and reality of favoritism, which is exactly why a secure random number generator matters for raffles and giveaways with real prizes on the line.

Tips for Accurate Results

• For raffles or giveaways with legal stakes, keep a record of the result (use the history log) in case you need to show how a winner was chosen by the giveaway winner picker.
• Check "No duplicate numbers" whenever you need distinct values, such as drawing multiple unique random numbers for a raffle without repeats.
• When picking winners from a list, double-check your pasted list for accidental duplicate names, since each line is treated as a separate entry in the random name picker.
• If you only need a simple yes/no or heads or tails call, the coin flip / coin toss online tool is faster than generating a random number and mapping it to two outcomes yourself.
• For tabletop games, match the die to the roll you need — a d6 dice roller for standard dice games, a d20 roller for tabletop RPGs, or a custom-sided virtual dice roll for anything in between.