Coin Flip Online
Free virtual coin toss — flip a coin online for instant heads or tails. No sign up, no download. Cryptographically strong pseudorandom result each time.
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Heads
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Total Flips
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Tails
Press Decide to flip
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About This Tool
What it does
Simulates a fair coin flip for heads or tails. Includes a decision maker mode where you assign options to each side.
Who it's for
Anyone making a quick decision, settling a dispute, playing games or teaching probability.
Your privacy
Completely local — no data is collected, transmitted or stored.
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Method, limits and privacy
Each result is selected with crypto.getRandomValues through rejection sampling, giving heads and tails equal intended probability without modulo bias. This is suitable for casual decisions, not regulated gambling, audited lotteries or security-key generation.
Sources reviewed 23 June 2026: Web Crypto API
Frequently Asked Questions
How is each virtual coin flip selected?
The tool uses the browser Web Crypto API and an unbiased integer sampler to choose between heads and tails. Each requested flip is sampled independently.
Is a virtual coin flip the same as physical randomness?
No. It is cryptographically strong pseudorandom generation supplied by the browser, not a measurement of a physical coin or a certified draw.
Why are the totals not always exactly 50/50?
Independent fair trials vary in short samples. A 50% probability for each side does not guarantee equal totals in any particular run.
What does Reset clear?
Reset removes the current result, multi-flip output, decision text, totals and streak statistics.
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