Coin Flip
Heads or tails, and the statistics of a run.
Coin Flip tosses a fair coin using cryptographic randomness, one flip at a time or thousands at once, and tracks the running tally, the longest streak and how far the result sits from the expected 50/50. It is a decision-maker and a small demonstration of how streaky true randomness is.
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Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Coin Flip
- Flip once for a decision.
- Or run a batch of hundreds and watch the tally.
- Read the streak and deviation statistics.
Questions about Coin Flip
Is it a fair 50/50?
Yes. Each flip reads a random bit from the operating system CSPRNG, with no bias in either direction. A real coin is slightly biased towards the side facing up when it is flipped; this is not.
Why did I get eight heads in a row?
Because that is what randomness looks like. In 100 flips a run of at least six is more likely than not. People expect random sequences to alternate more than they really do, which is the gambler's fallacy in miniature.
Does a previous flip affect the next?
Never. Each flip is independent — the coin has no memory, and neither does this page.
How many flips can I run at once?
Up to 100,000 in one batch, with the tally, the longest streak and the deviation from 50/50 recalculated across the whole run. The last 120 flips are shown individually, so the streaks are visible rather than hidden inside a total.
Is this fairer than tossing a real coin?
Marginally, yes. A physical coin lands slightly more often on the face that started upwards — around 51/49 in the published measurements — and a practised flipper can do rather better than that. This reads a random bit from the operating system, where neither bias nor technique applies.
Is Coin Flip really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Coin Flip?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.