Random Number Generator — Cryptographically Secure with Statistics

Generate one or many cryptographically secure random numbers within any range — with optional unique (no-repeat) mode, batch generation up to 1,000 numbers, and statistical analysis of your results. This generator uses the browser's Web Crypto API for randomness, making it appropriate for raffles, sampling, security applications, and any use case where true unpredictability matters. Standard JavaScript Math.random() is a pseudorandom generator — predictable under certain conditions and not suitable for security-sensitive applications. The statistics panel shows the mean, median, min, max, and distribution of your generated batch — useful for verifying the numbers are uniformly distributed and for educational purposes. Common use cases include: random sampling for surveys, raffle and lottery drawings, randomizing a list for blind testing, and classroom activities where unbiased selection matters. The unique (no-repeat) mode ensures no number appears twice in a batch — essential when duplicates would invalidate the result, such as assigning students to groups or selecting winners from a fixed pool.