How this flip is generated
The tool draws a random 32-bit value with the browser's Web Crypto API and maps its parity to heads or tails. For a uniformly distributed value, even and odd results are equally likely.
Classic heads or tails
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Automatic uses your country when available and stores your choice locally.
Automatic coin set
Press Space to flip. The flip runs in your browser.
Heads or tails.
The classic flip.
Need a quick fifty-fifty decision? Flip a digital coin online. Settle arguments, resolve ties, or make a split choice instantly.
About the Classic Heads or Tails Toss
Each result is generated in your browser with Web Crypto. This is a digital random choice, not a simulation of a physical coin flip.
What 50/50 means
Each new flip has the same two possible outcomes. A run of heads does not make tails more likely on the next flip, and a fair sequence does not have to look evenly split over a small number of tries.
Digital versus physical flips
Physical coins can show a slight same-side bias that depends on how they are launched and caught. A 2007 study estimated about a 51% chance of landing on the starting side for natural flips; that result concerns physical motion, not this browser-generated choice.
Why a physical flip can differ
Diaconis, Holmes and Montgomery's analysis of the natural coin-tossing process found that coins tend to land on the side they started on, with an estimated probability of about 0.51 for natural flips. The authors explain that the bias depends on the coin's motion and starting orientation. This is a small effect in physical tosses, not evidence that one side of a digital result is favoured.
This tool does not model a coin's wobble, spin or landing. It uses a cryptographically generated value, so the result is not affected by which side appeared last. The familiar 50/50 model is useful for each flip; short runs can still contain more heads or tails than expected.