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Random Number Generator

Generate random integers or decimal numbers within any range. Specify a minimum, maximum, and quantity to generate up to 10,000 numbers at once. Toggle "unique only" to guarantee no duplicates (useful for lottery draws or raffle selections), or enable sorted output for analyzing ranges. Uses the browser's crypto.getRandomValues() API for cryptographically strong randomness.

Common Use Cases

Raffles and giveaways \u2014 pick random ticket numbers from a known range. Study sampling \u2014 generate random participant IDs for research. Game development \u2014 create test data for random events, loot drops, or procedural generation. Data seeding \u2014 populate databases with random values during development. Decision making \u2014 roll a virtual die (1-6), flip a coin (1-2), or make a yes/no choice (0-1). Statistics and probability teaching \u2014 demonstrate distributions by generating large samples.

Frequently Asked Questions

Is this truly random?+
The tool uses cryptographically secure pseudo-random numbers (CSPRNG) via the browser's Web Crypto API. This is suitable for nearly all applications including raffles, sampling, and simulations. For generating cryptographic keys or security tokens, use a dedicated CSPRNG library.
Can I generate negative numbers?+
Yes. Set the minimum to a negative value (e.g. -50) and the maximum to a positive value (e.g. 50) to generate numbers across zero. Both min and max can be negative if you want only negative numbers.
Why can't I generate more unique numbers than my range?+
If you request 100 unique integers from a range of 1-50, there are only 50 possible values. It's mathematically impossible to have 100 unique numbers. Either expand the range or disable the unique-only option.

Built by Derek Giordano · Part of Ultimate Design Tools

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