Is the coin really fair?

Yes. Each flip uses a single random bit drawn from crypto.getRandomValues, which is uniformly distributed. There is no bias toward heads or tails.

Why do I sometimes see long streaks of heads or tails?

Streaks are expected from a fair coin. In 50 flips, runs of 5 or 6 the same side are common. The tool does not nudge the result toward "balance" — that would make it less fair, not more.

How many flips can I run at once?

Up to 1000 flips in a single batch. The sequence display is hidden for batches over 100 to keep the page readable; Copy still gives you the full sequence.

Can I use this to decide important things?

For everyday choices, yes — the randomness is genuinely high quality. For anything legally or financially serious, use a documented physical or audited online draw with a witness.

Does the coin remember previous flips?

No. Each flip is independent. There is no memory and no streak compensation — that is what makes the simulation fair.

Coin Flip

Flip a virtual coin from 1 to 1000 times with a heads/tails count and sequence log.

Written by Golam Rabbani, Founder & Lead Engineer

This interactive tool requires JavaScript. Read the formula and worked example below; you can compute the result by hand.

How to use this coin flip

Enter how many flips you want (1 to 1000).
Press Flip to see the outcome.
For a single flip, read Heads or Tails. For multiple flips, read the tally and the H/T sequence.
Use Copy to share the result, or Reset to start over.

About this coin flip

The coin flip tool simulates a perfectly fair two-sided coin using crypto.getRandomValues — the browser's cryptographic random number generator. For each flip it pulls one unbiased bit and maps 0 to Heads, 1 to Tails. There is no modulo bias and no shared server seed: every flip is independent.

For a single flip you get a clean Heads or Tails answer, useful for settling a quick decision. For batches up to 1000, the tool shows the heads count, tails count, and (for batches of 100 or fewer) the full ordered sequence as H and T characters so you can spot streaks. With large samples the heads/tails counts should converge toward 50/50; with small samples some imbalance is normal and expected.

For example, flipping 10 times might give 6 heads and 4 tails with the sequence HHTHTHHHTH. Flipping 1000 times typically lands within a few percent of 500/500 — try it and watch the law of large numbers do its job. All flips run locally with no network requests.

FAQ

Is the coin really fair?: Yes. Each flip uses a single random bit drawn from crypto.getRandomValues, which is uniformly distributed. There is no bias toward heads or tails.
Why do I sometimes see long streaks of heads or tails?: Streaks are expected from a fair coin. In 50 flips, runs of 5 or 6 the same side are common. The tool does not nudge the result toward "balance" — that would make it less fair, not more.
How many flips can I run at once?: Up to 1000 flips in a single batch. The sequence display is hidden for batches over 100 to keep the page readable; Copy still gives you the full sequence.
Can I use this to decide important things?: For everyday choices, yes — the randomness is genuinely high quality. For anything legally or financially serious, use a documented physical or audited online draw with a witness.
Does the coin remember previous flips?: No. Each flip is independent. There is no memory and no streak compensation — that is what makes the simulation fair.