Coin Flip
Heads or tails? Tap the coin for an instant, provably fair 50/50 result — flip many at once for the stats, or label the sides to settle any decision.
Rename the sides (Yes/No, Team A/B…)
Running total
No flips yet — tap the coin to start.
The more you flip, the closer the split gets to a 50/50 — that's the law of large numbers.
Sequence
자주 묻는 질문
Is this coin flip really fair and random?
Yes. Every flip is decided by your browser's cryptographically secure generator (crypto.getRandomValues), not the predictable Math.random — so it's an exact, unriggable 50/50 heads or tails with no house edge and no ads. Nothing about the outcome can be nudged, and you can flip a coin as many times as you like for free.
How do I decide what heads and tails mean?
Open "Rename the sides" and type your own two options — Yes/No, Team A/Team B, Pizza/Sushi, anything. The coin's faces and the results use your labels, turning this coin flip into an instant decision maker. Leave a field blank and it falls back to the default Heads or Tails, so a side is never empty.
What do the statistics show when I flip many coins?
Switch to "Flip many", enter a number, and the coin toss simulator tosses that many coins at once and shows the heads and tails counts with percentages. With only a few flips you often see lopsided results like 7 heads, 3 tails; flip hundreds and the split settles close to 50/50. That's the law of large numbers in action — a handy demo for teaching or exploring probability.
Are my flips or results stored or sent anywhere?
No. Every coin flip runs entirely in your browser and nothing is sent to any server. Your running tally and custom labels are saved only in your device's local storage for convenience, and "Reset stats" clears the counts whenever you want.
Is a coin flip exactly 50/50?
Digitally, yes — this simulator gives each side an exact 50% chance on every toss, with no memory of past results. A real, physical coin is very close but not perfect: tiny differences in weight, how it's caught, or a rare edge landing can add a fraction of a percent of bias. For a clean, unbiased heads or tails, a crypto-backed digital flip is actually fairer than the real thing.