Coin Flip
Flip a virtual coin online with realistic 3D animation. Cryptographically fair 50/50 heads or tails. Free, runs 100% in your browser.
Reference
How does the coin flip work?
This tool uses the crypto.getRandomValues() Web API to generate a cryptographically secure random value and maps it to Heads or Tails with exactly equal probability. The 3D flip animation uses CSS transforms for a realistic coin toss effect. The history panel tracks all results so you can verify fairness over many flips.
When to use a coin flip
- Quick decisions — settle debates, pick between two options, or break ties.
- Games — determine who goes first in board games, sports, or competitions.
- Probability experiments — demonstrate the law of large numbers with tracked history.
- Teaching — illustrate basic probability concepts in classrooms.
Is this truly fair?
Yes. The result is determined by crypto.getRandomValues(), a cryptographic random number generator built into your browser. It produces a mathematically perfect 50/50 distribution — far fairer than a physical coin, which can have slight weight biases.
Privacy
All randomness is generated 100% in your browser. No data is sent to any server.