Is the coin flip fair?

Yes. Each flip reads a fresh random bit from the browser's Web Crypto API, giving an even 50/50 chance of heads or tails every time.

Can I flip many coins at once?

Yes — set how many flips you want (up to 1000) and the tool returns the full sequence plus heads and tails totals.

What are the odds of heads on a single flip?

Exactly 50%. Each flip is independent, so previous results never change the next flip's odds — heads and tails remain equally likely every time.

Why use Web Crypto instead of Math.random?

The Web Crypto API is a cryptographically strong random source, so the bit it produces is unbiased and unpredictable — fairer than the standard pseudo-random generator for settling real decisions.

Does this track my results?

No — every flip happens locally in your browser using the Web Crypto API. Nothing is uploaded or stored.

Coin Flip — Gera Tools

This coin flip tool settles a decision with a fair heads or tails call, or runs a batch of flips so you can watch the odds play out over many trials. It is useful for making a quick choice, breaking a tie, teaching probability, or generating a random binary outcome — all without a physical coin.

How it works

Each flip reads a fresh random byte from the browser’s Web Crypto API and takes its lowest bit. A bit of 0 becomes Heads and 1 becomes Tails, giving a true 50/50 chance every time. Because the crypto source is unbiased, the result is fair and unpredictable. For a batch, the tool repeats this for each flip (up to 1,000) and tallies the totals.

Example

Ask for 10 flips and you might get:

H T T H H T H T T H — Heads: 5, Tails: 5

Over a small batch the split is often uneven (say 7 heads, 3 tails); over thousands of flips it converges toward 50/50, which is a good illustration of the law of large numbers. Everything runs in your browser, nothing uploaded.