Coin Flip
Choose a random source, optionally enter a seed, and flip a local fair coin.
Ready to flip.
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Streak: 0
A QUICK WALKTHROUGH
How to use this tool
- Choose browser crypto for a fresh result or enter a seed for reproducible flips.
- Flip the coin and review the current side and streak history.
- Use the probability note to understand that each side is 50% per flip.
Fair two-sided result
Each flip chooses Heads or Tails with equal probability. Browser crypto randomness uses crypto.getRandomValues when available.
Optional reproducible seed
A numeric seed uses a deterministic local generator, useful for demonstrations and repeatable examples. It is not cryptographic.
GOOD TO KNOW
Common questions
What is the probability of each side?
Each independent flip has a 50% probability of Heads and a 50% probability of Tails.
Does a seed make the result secure?
No. A seed makes the sequence reproducible; choose browser crypto for fresh randomness.
Is history saved?
No. The streak history stays in this page session and is not uploaded.