Search a tool
en

Coin Flip

One click, one fair coin flip: heads or tails via cryptographic randomness, with a running tally - entirely local in your browser.

Verifiably fair: The draw uses your browser's cryptographic random generator (crypto.getRandomValues) instead of a simple pseudo-random one - the same mechanism encryption relies on. Every possible outcome is exactly as likely as the weights say, with no bias from rounding. Everything runs locally in your browser; there is no server that could influence or manipulate the result.

In 3 steps

  1. Flip the coin.
  2. See the result (heads or tails).
  3. Keep an eye on the running tally.

History

No result yet.

    Everything stays on your device: no account, no server, exportable and deletable at any time.

    Is my file uploaded?

    No. Everything runs in your browser - your file never leaves your device. How this is verifiable

    No upload100% local
    Your content stays with youno third-party access
    Hosted in GermanyGlobal Content Delivery
    Independently auditedTLS A+ · HTTP headers A+

    The coin flip makes a simple yes/no or heads/tails decision at random - handy as a decision aid, for teaching probability, or simply for the coin toss before a match. One click is enough, the result is instant.

    The flip uses a single fair random bit from your browser's cryptographic random generator (crypto.getRandomValues) - unlike a physical coin, there is no material bias, and the ratio is exactly 50/50 over many flips.

    A running tally (heads count vs. tails count) and your flip history stay stored locally in your browser - exportable and deletable with one click.

    An honest note on probability: even with a perfectly fair coin, short streaks - five heads in a row - are entirely normal and no sign of a fault. Only over many flips does the ratio approach 50/50 (the law of large numbers); that is exactly what the running tally lets you watch live, which makes the coin flip a vivid tool for teaching probability.

    Specifications

    Specifications
    Input formatsNo file (generator)
    Batch processingNo
    ProcessingLocally in your browser (JavaScript)
    File uploadNone

    Limitations: The coin flip is a simple decision and teaching tool, not a certified random source for regulated gambling. Everything stays local in your browser.

    FAQ

    Are my flips uploaded or stored?

    No, everything runs locally. Your flip history and tally live in your browser storage, exportable and deletable at any time.

    Is the coin flip really 50/50 fair?

    Yes - it uses a single random bit from crypto.getRandomValues instead of a simple pseudo-random one, without a real coin's material bias.

    What is the coin flip good for?

    For quick yes/no decisions, teaching probability, or a fair coin toss before a sports match.

    Can I reset the tally?

    Yes, via the delete button on the local history - the tally then starts again from zero.

    Is this a certified random source for gambling?

    No - the coin flip is a simple decision and teaching tool, not a certified RNG solution for regulated gambling applications.

    Related tools

    Matches your result