Random Number Generator

Generate unique or repeatable random numbers within custom ranges, supporting multiple draws, sorting, and cryptographic randomness. Typical uses include lottery and raffle number drawings, statistical sampling and research randomization, tabletop gaming, board games, and probability simulations, and generating random security PINs and verification codes. The focused Random Number Generator workflow is intended for people who need a dependable result without opening a larger desktop application or creating an account for a one-off task.

Generates random bytes using window.crypto.getRandomValues and maps them uniformly across the requested integer interval using rejection sampling to eliminate modulo bias. Its controls cover cryptographically secure pseudo-random number generator (CSPRNG), customizable range with support for negative and large integers, batch generation with unique (no repeats) or duplicate options, ascending, descending, or raw sequence sorting, and one-click clipboard copy and formatted text download. The tool accepts min Value, Max Value, and Count. It produces list or grid of formatted numbers that can be reviewed before it is saved.

Unique number generation cannot exceed the range span (e.g. max - min + 1). JavaScript safe integer limits apply (values between -9,007,199,254,740,991 and 9,007,199,254,740,991). When Random Number Generator is marked as in-browser, its work remains on the current device; available memory, processor speed, browser support, permissions, and source quality can still affect the result. Keep the original material supplied to Random Number Generator until its list or grid of formatted numbers has been checked for the intended use.