Random Number Generator — Free Online Tool

The Random Number Generator produces numbers within a range you specify, with options for how many to generate and whether duplicates are allowed.

The distinction worth understanding is between randomness that is unpredictable-enough and randomness that is cryptographically secure. Ordinary pseudorandom generators produce sequences that pass statistical tests but are deterministic — given the internal state, the next value is predictable. That is entirely fine for picking a raffle winner, rolling dice, or choosing a sample. It is not fine for anything an adversary has a reason to predict: tokens, keys, or passwords, which need a cryptographic source.

Allowing or excluding duplicates changes what you are actually modelling. Drawing with replacement — duplicates allowed — is like rolling a die repeatedly, where every roll is independent. Drawing without replacement is like dealing cards, where each pick reduces the pool. Picking five winners from a list needs the second; simulating five dice rolls needs the first.

A note on what randomness looks like, since it causes recurring suspicion that a generator is broken: genuinely random sequences contain clusters and repeats far more often than intuition expects. Three consecutive numbers in a small range, or the same value twice in a short run, is normal rather than evidence of a fault. Sequences that look evenly spread are usually the ones that have been tampered with.

Generation happens in your browser.

Our Random Number Generator is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.

Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.