About flipping a coin online
A real coin is not quite an even bet. The side facing up when it leaves your hand comes up slightly more often, and a spun coin can favour one face by more than that, depending on how the edge is milled. A digital flip has no such physics: each one is an independent draw with exactly one chance in two.
That independence is worth remembering when a run goes one way. Ten heads in a row does not make tails any more likely on the eleventh flip, because the coin has no memory of the ten before it. Over enough flips the two sides converge on half each, which is what the tally above shows, but they get there by the counts growing rather than by anything correcting itself.
Where the randomness comes from
This tool runs entirely in your browser, using its built in cryptographic random number generator. Nothing you type is sent to us, nothing is stored, and each result is thrown away the moment you leave the page. Numbers are drawn without the rounding bias that the usual shortcut introduces, so every outcome is as likely as every other.
Because nothing is recorded, a result here proves nothing to anyone afterwards. If you need a drawing that other people have to accept, for a prize, a campaign or an audit, use Winner Picker, which publishes each result on a permanent link with a signed record anyone can check.