Random Boolean Generator

Random Boolean Generator

Generate batches of random true/false values with a click. Configure how many you need and how likely each result is to be true — from a fair 50/50 coin flip to heavily skewed distributions.

When you need random booleans

• Unit tests — seed test fixtures with realistic mix of true/false flags.
• Simulations — model binary events with a known probability (70% success rate, 10% packet loss, etc.).
• Data mocking — populate boolean columns in CSV seeds or JSON fixtures.
• Probability education — visually confirm that 100 coin flips produce roughly 50% heads.
• UI testing — generate checkbox states for rendering stress tests.

Probability control

The slider sets the probability that each value will be true:

• 50% — unbiased coin flip, expected half true half false.
• 10% — rare event: roughly 1 in 10 will be true.
• 90% — common event: roughly 9 in 10 will be true.
• 0% / 100% — constant false / constant true (useful for baseline tests).

Each value is independently drawn — past results don't affect future ones.

Randomness

Each value is drawn using crypto.getRandomValues (the browser's CSPRNG), so results are uniformly distributed and cryptographically unbiased. For 5,000 values at 50% probability, expected true count ≈ 2,500 ± ~35 (within 1 standard deviation).

Output

Results appear live as you adjust the inputs. Copy-all puts every value on its own line. Download saves booleans.txt.

Privacy

All generation happens in your browser. Nothing is sent to a server.