Random Number Generator
Generate random numbers in any range, with or without duplicates
What is this tool?
Generates one or more random numbers within a range you set, with an option to avoid duplicate results.
How to use it
Set your minimum and maximum values and how many numbers you want, then generate. Toggle "no duplicates" if you need each result to be unique.
This uses your browser's cryptographically secure random number source rather than a simpler pseudo-random one, which matters if you're using the result for anything where true randomness counts, like a raffle drawing.
Watch: Random Number Generator in Action
Watch on YouTubePlays on YouTube (counts toward our @freedailypro channel).
Frequently asked questions
How to use Random Number Generator
Set your minimum and maximum values and how many random numbers you want generated, then click generate. If you need every result to be unique (no repeated numbers in the same batch), toggle the "no duplicates" option before generating -- without it, the same number can appear more than once in a single batch, which is expected default behavior for genuine independent random draws, similar to rolling the same die value twice in a row being entirely normal.
When to use it
Useful for any situation needing a genuinely random selection -- picking a winner from a numbered raffle or giveaway, randomly selecting a sample from a numbered list for a survey or audit, generating random test data for a spreadsheet or database, or settling something with an agreed-upon random draw rather than a subjective choice.
When not to use it
For generating a large, statistically rigorous random sample for formal research or scientific purposes, a dedicated statistical software package with documented, peer-reviewed random sampling methodology is more appropriate than a general-purpose web tool -- this tool is built for everyday practical randomness (raffles, quick decisions, casual sampling), not formal statistical research requiring documented methodology.
Tips for best results
For anything where the fairness of the randomness genuinely matters to people relying on the result -- a raffle drawing with real prizes, for instance -- this tool's use of your browser's cryptographically secure random source (rather than a simpler, more predictable pseudo-random method some tools use) is worth explicitly mentioning to participants, since it's a genuinely stronger randomness guarantee than many casual random-number tools provide.
Limitations
Requesting more unique numbers than actually exist in your specified range (asking for 50 unique numbers between 1 and 20, for instance) isn't mathematically possible -- the tool will indicate this rather than silently returning fewer numbers than requested or duplicate values despite the no-duplicates setting.
Privacy
Generation happens entirely in your browser using your browser's own cryptographically secure random number source -- nothing about your generated numbers or chosen range is sent to or stored on any server.
More from Converters & Calculators: