Is the number generation truly random?

Yes. The generator uses crypto.getRandomValues() for unbiased randomness, the same source used for cryptographic applications. It is not pseudorandom like Math.random().

What is the maximum range I can use?

For integers, the range can span up to Number.MAX_SAFE_INTEGER (9,007,199,254,740,991). Very large ranges use BigInt internally to avoid modulo bias. For floats, the range is limited to standard IEEE 754 double precision.

What does "no-repeat" mean?

When no-repeat is enabled, the batch will not contain duplicate values. The count must be no greater than the total integers in the range. For floats, no-repeat is disabled because duplicates are extremely unlikely already.

Can I generate numbers for a lottery or raffle?

Yes. Set the range to match the lottery draw (e.g. 1–49), enable no-repeat, and generate the required count. The output is as random as your browser's crypto API allows.

What is the difference between integer and float mode?

Integer mode returns whole numbers with no decimal part. Float mode returns numbers with up to 6 decimal places, useful for probability simulations, coordinates, or sampling.

Can I download the output?

Use the Copy button to copy the list to the clipboard. You can then paste it into a spreadsheet or text file. A dedicated CSV download may be added in a future version.

Are the numbers sorted?

By default, numbers appear in generation order (random). Enable "Sort output" to display them in ascending numeric order.

How many numbers can I generate at once?

Up to 10,000 per batch. Generating very large batches may take a moment for no-repeat validation over small ranges.

Generators /

Random number generator

Generate random integers or floats in any range. Single or batch output with optional no-repeat and sort. Powered by the Web Crypto API.

100% in your browser. Numbers generated locally, nothing sent.

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No-repeat (unique values) Sort output ascending

Output

How to use

Set the minimum and maximum bounds for the range.
Enter the count of numbers you want to generate.
Choose Integer for whole numbers or Float for decimal values.
Enable No-repeat for unique values (useful for lotteries and raffles).
Click Generate, then Copy to use the output.

Common use cases

Lottery picks — no-repeat integers in a competition range.
Random sampling — pick N random indices from a dataset.
Simulation — float values for Monte Carlo or probability models.
Classroom exercises — generate quiz numbers or random student IDs.

Also see: Random String Generator for text tokens, UUID Batch Generator for unique identifiers.

常见问题

Is the number generation truly random?: Yes. The generator uses crypto.getRandomValues() for unbiased randomness, the same source used for cryptographic applications. It is not pseudorandom like Math.random().
What is the maximum range I can use?: For integers, the range can span up to Number.MAX_SAFE_INTEGER (9,007,199,254,740,991). Very large ranges use BigInt internally to avoid modulo bias. For floats, the range is limited to standard IEEE 754 double precision.
What does "no-repeat" mean?: When no-repeat is enabled, the batch will not contain duplicate values. The count must be no greater than the total integers in the range. For floats, no-repeat is disabled because duplicates are extremely unlikely already.
Can I generate numbers for a lottery or raffle?: Yes. Set the range to match the lottery draw (e.g. 1–49), enable no-repeat, and generate the required count. The output is as random as your browser's crypto API allows.
What is the difference between integer and float mode?: Integer mode returns whole numbers with no decimal part. Float mode returns numbers with up to 6 decimal places, useful for probability simulations, coordinates, or sampling.
Can I download the output?: Use the Copy button to copy the list to the clipboard. You can then paste it into a spreadsheet or text file. A dedicated CSV download may be added in a future version.
Are the numbers sorted?: By default, numbers appear in generation order (random). Enable "Sort output" to display them in ascending numeric order.
How many numbers can I generate at once?: Up to 10,000 per batch. Generating very large batches may take a moment for no-repeat validation over small ranges.

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