Generate truly random numbers, dice rolls, lottery numbers and random lists. Cryptographically random using the browser's secure random API.
Random Number
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Result
Generate a number to see results here.
History
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Cryptographically random
Uses window.crypto.getRandomValues() — the browser's secure random API used by password managers and cryptographic libraries.
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True range control
Set any min and max value. No hidden biases — each number in the range has exactly equal probability.
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Multiple numbers
Generate up to 1,000 numbers at once. Toggle "no duplicates" for lottery-style draws.
Frequently Asked Questions
Is the random number generator truly random?
The generator uses cryptographically secure random number generation via the browser's Web Crypto API (crypto.getRandomValues), which produces numbers suitable for security purposes. This is significantly stronger than Math.random() used by most basic generators.
Can I generate multiple random numbers at once?
Yes. You can specify how many random numbers to generate in a single batch. The tool supports generating lists of random integers, random decimals, dice rolls, and lottery-style number sets.
What is the maximum range I can use for random number generation?
The generator supports ranges from any negative or positive integer up to JavaScript's safe integer limit of 9,007,199,254,740,991. For most practical uses such as dice rolls or lottery numbers, the range will be well within these limits.
Is this truly random?
Yes. We use window.crypto.getRandomValues() which is the browser's cryptographically secure random number generator — the same API used by password managers and crypto wallets. It is far more random than Math.random().
What is the maximum range?
You can set any min and max value within JavaScript's safe integer range (±9007199254740991). For practical use, ranges up to a billion work perfectly.
Can I generate lottery numbers?
Yes — click the Lottery preset to generate 6 unique numbers between 1 and 49 (UK National Lottery range). Enable "no duplicates" to ensure each number appears only once.
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Most programs use pseudo-random numbers, which are fast but predictable if you know how they were started. This generator uses your browser's cryptographic random source, the Web Crypto API, which is the same kind of randomness used for encryption keys, so results cannot be predicted. It produces numbers in any range, dice rolls, lottery-style draws and coin flips.
Common uses
Giveaways and raffles. Number the entries, then draw a number in that range. Explain the method in advance so participants trust the result.
Sampling. Pick random rows from a spreadsheet for testing or quality checks.
Games and classrooms. Roll dice, pick teams or decide who goes first.
Test data for forms and databases.
Things to know
Repeats. Lottery-style draws never repeat a number, while dice rolls can.
Fair ranges. A good generator gives every number in the range the same chance, including the lowest and highest.
Streaks are normal. The same number twice in a row does not mean the generator is broken; real randomness often looks clumpy.
Passwords. Use the dedicated password generator, which builds passwords from a full set of characters.