Random Number Generator

Generate secure random numbers instantly. Choose a range, quantity, and whether numbers can repeat.

Quick Presets

Click Generate Numbers above to produce random values.

Generated securely in your browser with zero server tracking.

How to Generate Random Numbers

Follow these three simple steps to produce unbiased, secure random integers in seconds.

Set Range Boundaries

Enter your Minimum and Maximum values. Negative numbers, zero, and large safe integers are fully supported.

Choose Quantity & Options

Specify how many numbers to generate. Check No duplicate numbers if every value must be distinct, or add custom exclusions in Advanced Options.

Generate & Copy Results

Press Generate Numbers to get instant results calculated via client-side Web Crypto. Copy individual numbers or the entire batch with one click.

Common Number Presets

Click any preset to load its configuration instantly.

Fair Random Selection & Client-Side Execution

Random Number Generator uses the native Web Cryptography API (window.crypto.getRandomValues) to generate true unbiased entropy rather than predictable pseudo-random formulas. Rejection sampling eliminates modulo bias so every integer in your range has precisely equal mathematical probability. Your data and lists are processed entirely on your device and are never sent to external servers.

Frequently Asked Questions

Common questions about number generation, options, and randomness.

Is RandomizeTools free to use?

Yes. RandomizeTools is 100% free with no registration, no paywalls, and no usage limits.

How does the random number generator work?

We use the Web Cryptography API (window.crypto.getRandomValues) combined with rejection sampling. This ensures true uniform randomness across your range and completely avoids modulo bias.

Can I generate multiple numbers at once?

Yes. Enter any quantity from 1 up to 10,000 in the "How Many Numbers?" field. You can copy individual results or copy all numbers at once with a custom separator (space, comma, or new line).

Can I generate numbers without duplicates?

Yes. Simply check "No duplicate numbers (unique values only)". The tool will ensure every generated number in the set is distinct.

Can I generate negative numbers or include zero?

Yes. You can enter negative values (such as -100 to -1), zero-crossing ranges (such as -10 to 10), or positive ranges (such as 1 to 100).

Can I exclude specific numbers from the results?

Yes. Open "Advanced Options" and enter comma-separated numbers (e.g. 5, 10, 13, 25). Those values will be skipped during generation.

How do I generate a random number between 1 and 100?

Keep the default settings (Minimum = 1, Maximum = 100, Quantity = 1) or click the "1–100" quick preset, then click "Generate Numbers".

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