Coin Flip

Flipping a coin is the classic way to make a fair, unbiased decision or settle a friendly dispute — heads or tails, fifty-fifty, no arguing with chance. An online version is handy when you don't have a coin in your pocket, when you want to flip many times quickly, or when you want a tally kept for you.

Beyond settling who goes first, coin flips are used to teach probability, to make genuinely arbitrary choices when overthinking would only waste time, and even as a decision aid: the moment the coin is in the air, you often notice which result you were secretly hoping for.

A real coin is random because of the messy physics of the toss. Recreating that fairness digitally requires a good source of randomness. This tool uses your browser's cryptographically secure random generator — the same quality of randomness used to create encryption keys — rather than the simpler, more predictable randomness many casual scripts rely on. Each flip is an independent, true 50/50.

That independence is worth understanding: past flips never influence the next one. After five heads in a row, the sixth flip is still exactly 50/50. Believing a tails is 'due' is the gambler's fallacy — the coin has no memory. The running tally here just records what happened; it doesn't shift the odds.

Over many flips the count of heads and tails drifts toward equal, but streaks are completely normal along the way — runs of four or five of the same side happen more often than intuition expects. Seeing them doesn't mean the coin is biased; true randomness looks streakier than the tidy alternation people imagine.

If you need to choose between more than two options, a dice roller or a random picker is a better fit than repeated coin flips. Everything here runs on your device, with nothing sent to a server.