Coin Flipper

How to use

1. Choose the Number of Flips — Enter 1 for a single flip or up to 10,000 for statistical experiments.
2. Press Flip — Each flip uses the browser's Web Crypto API for true unbiased randomness.
3. Read the Result — See every outcome plus a Heads vs Tails count and percentage.

Free Online Coin Flipper

A virtual heads-or-tails coin flipper that uses your browser's cryptographic random number generator. Perfect for settling decisions, picking sides, classroom probability lessons, or running quick experiments. Single flip or bulk up to 10,000 at once.

Why a Web Crypto Coin Flip?

Most online flippers rely on Math.random(), which is fast but not designed for fairness. We use crypto.getRandomValues, the same secure entropy source used for password generation. Every outcome is statistically independent and unbiased.

Common Uses

• Decide who goes first in a game
• Settle a tie between two choices
• Demonstrate the law of large numbers in a classroom
• Generate random binary choices for surveys or A/B testing

Privacy

All flips happen locally in your browser. No outcomes are logged or transmitted.

Related: Dice Roller, Random Number Generator, Password Generator.

Frequently asked questions

Is this coin flip really random?

Yes. It uses crypto.getRandomValues, the same cryptographic source browsers use for keys and tokens. Each flip is independent and unbiased — a true 50/50.

Can I flip many coins at once?

Yes, up to 10,000 flips at a time. The summary instantly shows Heads vs Tails counts and percentages.

Does the tool work offline?

Yes. Everything runs in your browser. Once the page loads you can disconnect from the internet.

Is anything sent to a server?

No. No data is transmitted, stored, or logged. Your flip history stays on your device.

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