Random Number Generator

Range Mode

Generates uniformly distributed integers in your chosen range using crypto.getRandomValues() with rejection sampling for unbiased results. Output in decimal, hex, octal, or binary.

Bit Length Mode

Produces cryptographically secure random bytes via the Web Crypto API. Values are shown simultaneously in hex, decimal (for values up to 64 bits), binary, and Base64. Useful for generating encryption keys, nonces, tokens, and session IDs.

Gaussian Mode

Uses the Box-Muller transform to generate normally distributed random numbers with configurable mean and standard deviation. Includes a distribution histogram for visual verification.

Lottery Mode

Draws unique numbers from a pool with optional bonus balls from a separate pool — matching real lottery formats like Powerball, Mega Millions, and EuroMillions.

You can embed this util on your own site as a widget. Adding ?embed=1 to the URL loads a compact version with just the tool itself; no header, menu, or documentation. Paste this snippet into your HTML:

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