Coin Flip

Flip a virtual coin online

Click Flip for a single coin toss, or increase the count to flip many coins at once and see the distribution. All randomness comes from the Web Crypto API — the same source used for cryptographic operations — so every flip is genuinely unpredictable. Nothing is sent to a server.

Running many flips at once is a simple way to observe the law of large numbers: as the count grows, the ratio of heads to tails converges toward 50/50 even though each individual flip is independent.

FAQ

Is the coin fair? Yes. Each side has exactly a 50% probability of appearing, based on a single bit from crypto.getRandomValues.

Can I flip more than 1000 coins? The page supports up to 1000 flips at once for a clear display. The underlying function supports up to 10,000.

What is the streak record? With a truly random coin, long streaks are rare but expected. The log shows all results if you want to spot patterns.