Coin Flip
Coin Flip returns Heads or Tails from browser-generated random data. It is useful for informal tie-breaks, games, and demonstrations where both labels are intended to have equal probability. One result says nothing about what should happen next, and a short sequence often looks uneven even when each flip is independent.
Runs locally — files stay on your deviceWhat are the possible coin-flip results?
Each flip returns either Heads or Tails, with an intended probability of one half for each.
A fair coin models a binary random event
A binary event has two possible outcomes. Independence means the next flip is not changed by earlier results; five Heads in a row does not make Tails due.
How it works
Run the tool once for one decision or repeat it for an informal sequence. Agree before flipping which outcome maps to which choice.
Key concepts
Independence does not force alternation
Runs and repeated outcomes are normal; each flip is a new event.
Fair procedure includes prior agreement
The random output is only one part of fairness. Participants must agree on the rules first.
When to use it
- Break an informal tie between two equivalent options.
- Choose a starting player in a game.
- Demonstrate binary probability.
When not to use it
- Do not use it for regulated drawings, gambling, or audited allocation.
- Do not use chance to make high-stakes safety, medical, legal, or financial decisions.
- Do not reinterpret the mapping after seeing the result.
Worked examples
Choose who starts
- Input
Heads = Alex, Tails = Sam- Expected output
One label
The mapping is fixed before the flip.
Five flips
- Input
Repeat five times- Expected output
A sequence that may be uneven
Small samples need not contain equal counts.
Three Heads already occurred
- Input
Run again- Expected output
Heads or Tails remains possible
Earlier outcomes do not create a debt.
Common mistakes
Expecting alternation
Random sequences can contain runs. Correction: Treat each flip independently.
Changing the assigned choices afterward
That defeats the agreed procedure. Correction: Record the mapping before flipping.
Using an informal tool for an auditable draw
There is no public seed, record, or external witness. Correction: Use a governed, auditable process.
Best practices
- Agree on mappings before the result.
- Use only for low-stakes informal choices.
- Record results separately if a game needs history.
Related operations and differences
Dice Roller
Choose Dice Roller when you need to roll one or more dice with custom side counts.; use Coin Flip specifically for coin.
Yes or No Generator
Choose Yes or No Generator when you need to make a simple random binary choice.; use Coin Flip specifically for coin.
Random Decimal Generator
Choose Random Decimal Generator when you need to generate a decimal inside a chosen range.; use Coin Flip specifically for coin.
Random Integer Generator
Choose Random Integer Generator when you need to generate an integer inside an inclusive range.; use Coin Flip specifically for coin.
Random List Picker
Choose Random List Picker when you need to pick one item from a pasted list.; use Coin Flip specifically for coin.
Random Order Generator
Choose Random Order Generator when you need to shuffle a pasted list into random order.; use Coin Flip specifically for coin.
Limitations and privacy
- The page does not expose a seed or verifiable audit trail.
- It is not a certified gambling or regulated-drawing system.
- Short sequences can be highly unbalanced.
Inputs and generated results stay in this browser. No list or result is uploaded.
Frequently asked questions
Is the next result affected by previous flips?
No. Each generated flip is independent in the intended model.
Does a run of Heads make Tails more likely?
No. That belief is the gambler's fallacy.
Can I verify the random seed?
No. The page does not provide a reproducible public seed.
Should I use this for a prize drawing?
Not when the drawing requires legal, certified, or auditable procedures.