Coin Flip
Toss a fair, unbiased coin for an instant heads or tails. Flip a single coin to settle a decision, or flip a whole batch at once to see the tally and percentages — with a running count kept privately in your browser.
Ready to flip
Each flip is a fair 50/50 toss generated in your browser with the cryptographically strong crypto.getRandomValues API — nothing is sent to any server.
Understanding the Coin Flip
A coin flip is the classic way to settle a decision or break a tie: assign one option to heads and the other to tails, then let chance decide. This online version replaces the physical coin with a digital one that is genuinely fair — heads and tails each carry an exact 50% probability on every toss. You can flip a single coin for a quick yes-or-no answer, or flip hundreds or thousands at once to watch the law of large numbers pull the split toward 50/50. Everything runs in your browser, so it is instant, private, and works offline once the page has loaded — no app or sign-up required.
How it works
When you press Flip, the tool asks your browser for a cryptographically strong random byte using the built-in crypto.getRandomValues API. It then reads the lowest bit of that byte: a 0 becomes heads and a 1 becomes tails. Because that bit is equally likely to be 0 or 1, each flip is a true, unbiased 50/50 event with no memory of previous results. When you flip many coins, the tool repeats this for each one, counts the heads and tails, and displays the tally plus percentages for that batch. A separate running total adds every flip across your session so you can watch the overall split converge toward an even balance.
Worked example
Suppose you and a friend cannot agree on who picks the movie. You set the count to 1, call heads, and flip — the coin lands Tails, so your friend chooses. Later you flip 1,000 coins at once to test fairness: the batch returns 508 heads and 492 tails, a 50.8% / 49.2% split. Flip another 1,000 and the running total across both batches drifts even closer to 50/50, showing the coin has no bias over many tosses.
Tips & common mistakes
- For a single decision, leave the count at 1 and call your side out loud before you flip so the result feels binding.
- Flip a large batch (say 1,000) to see fairness in action — small samples can look lopsided, but the percentages even out as the count grows.
- Use the running total to track a long session, and press Reset count whenever you want to start a fresh tally.
- Heads and tails are statistically identical here, so it does not matter which option you assign to which side.
- Each flip is independent — a streak of five heads does not make tails any more likely on the next toss (avoid the gambler's fallacy).
- Need three or more options instead of two? A dice roller or random number generator is a better fit than a coin.
Related tools
How to Use This Coin Flip
- 1Leave the count at 1 for a single toss, or enter how many coins you want to flip.
- 2Hit Flip and watch the coin land on heads or tails.
- 3Check the tally and running total, or reset the count to start fresh.
Frequently Asked Questions
Is this a fair 50/50 coin?
Yes. Every flip uses your browser’s built-in crypto.getRandomValues API, which produces cryptographically strong random values. Heads and tails each have an exact 50% chance on every toss, with no bias and no memory of previous results.
Can I flip many coins at once?
Absolutely. Set the “Number of coins to flip” field to any count up to 10,000 and flip them all in one go. The tool shows you the heads versus tails tally along with the percentage split for that batch.
Does it keep a running count?
Yes. Below each flip you’ll see a running total of every head and tail across all your flips this session, with percentages. Press “Reset count” any time to start the tally over from zero.