# Coin Flip Tool

> Coin flip tool: flip a coin online with truly random results, flip history counts, and multiple coin tosses for quick decisions and games. Free, no signup.

- **Canonical URL:** https://boringtoolskit.com/coin-flip/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** July 2026
- **Last verified:** 2026-09-20
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Each flip reads a 32-bit unsigned integer from the browser Web Crypto random-value source. Values below half the unsigned range map to Heads; values at or above half map to Tails, giving equal-size outcome ranges.

## Worked example

For deterministic test values [0, 4294967295, 1, 3000000000], the mapped sequence is Heads, Tails, Heads, Tails: two of each and a longest streak of one.

## Assumptions

- Each browser-generated 32-bit value is mapped independently to one of two equal-size ranges.
- Short samples can be uneven and can contain streaks even when the process is fair.
- The tool is for casual decisions and simulations, not regulated gaming, auditing, or key generation.

## Common questions

### Why was my batch not exactly 50/50?

Randomness describes long-run probabilities, not a promise that every short batch contains equal counts.

### Are flips sent to a server?

No. Random values and results are generated and processed locally in the browser.

### Can I use this for gambling or security keys?

No. It is designed for casual choices and simulations, not regulated outcomes, audits, lotteries, or cryptographic key management.

## Related tools

- /percentage-calc/
- /general-scientific-calculator/
- /date-calculator-workspace/

## Sources

- [Web Cryptography API](https://www.w3.org/TR/WebCryptoAPI/)

---

*Local planning estimate. Verify current terms, rates, and policies before acting.*