Random Boolean Generator

Produce true and false sequences with a chosen count and bias, in three output styles, plus a run-length summary.

Generate random booleans

How many values Bias towards true: 50 percent

Output style One value per line

Values: 0

True share: -

Runs: -

Longest run: -

Values come from crypto.getRandomValues, so the sequence is unbiased apart from the bias you set.

Set how many boolean values you need and drag the bias slider if true should be more likely.
Choose the true or false, one or zero, or yes or no output style.
Click Generate, then copy the sequence or read the run-length summary.

Common questions about the free online random boolean generator.

It produces a sequence of true and false values, each picked independently, so you can model coin flips or feature flags.

Set the count, choose a bias and an output style, then click Generate and copy the sequence you need.

It sets how often true appears, so fifty percent is a fair coin while ninety means true roughly nine times in ten.

They come from the browser's cryptographic random source and are mapped with rejection sampling to avoid modulo bias.

True and false words, one and zero digits, or yes and no words, either one per line or separated by commas.

A run is a group of identical values in a row. The summary counts the runs and reports the longest one.

Randomness looks clumpy. Even a fair coin often produces runs of four or five identical values in a few dozen flips.

Yes. The sequences are handy for populating fixtures, exercising branches and sampling boolean feature flags.

No. Every value is generated locally in your browser, so nothing you generate is transmitted or stored.

Yes. It is free and unlimited, needs no account, and works in any modern desktop or mobile browser.

Last updated: October 10, 2026