Random Number Generator: what this tool is for
Random numbers are essential for prize giveaways, raffle draws, board games, statistical sampling, scientific simulations (Monte Carlo methods), cryptography, and software testing. However, simple pseudo-random functions like standard `Math.random()` can suffer from statistical bias, predictable seeds, and non-uniform distributions.
Xorvian's Random Number Generator produces cryptographically random numbers directly in your web browser. Powered by the native Web Crypto API (`crypto.getRandomValues()`), the generator draws entropy from hardware noise to ensure uniform probability distribution across any custom minimum and maximum range.
Generate single numbers or bulk sequences of up to 1,000 numbers simultaneously. Features include a toggle to enforce unique numbers (no duplicates), sorting options (ascending, descending, or original draw sequence), and support for both integers and floating-point decimal precision.
100% private, client-side, and free: random number generation runs entirely in local browser memory with zero tracking and no account requirements.
No file stored
Nothing is saved on our servers, during or after processing.
Local processing
The computation runs in your browser whenever the technology allows it.
Instant result
No waiting and no export queue: the result appears live.
Free, no account
No sign-up, no daily limit and no intrusive ads.
What this tool gives you
Cryptographically Secure Entropy
Uses the native `crypto.getRandomValues()` Web Crypto API to ensure true uniform statistical distribution and unpredictable results.
Custom Number Range & Precision
Define any custom minimum and maximum range (including negative numbers) with integer or customizable decimal precision.
Bulk Generation (Up to 1,000 Numbers)
Generate single numbers or large sets of up to 1,000 random values simultaneously for statistical simulations or lottery draws.
Unique Numbers Toggle (No Duplicates)
Easily enforce unique non-repeating draws (sampling without replacement), essential for fair raffles, bingo games, and prize drawings.
Flexible Sorting & Organization
Sort generated results in ascending order, descending order, or keep the original random draw sequence.
Uniform Probability Distribution Integer Generation
All number generation executes in local browser memory. No draw outcomes or parameters are stored on external servers.
Real-world examples
Overview of typical random generation setups across common real-world use cases:
How to use Random Number Generator
Set Minimum and Maximum Boundaries
Enter your lower bound (Min) and upper bound (Max) in the range input fields.
Choose Quantity & Duplicate Settings
Select how many numbers you want to generate and toggle the 'Allow duplicates' switch as needed.
Select Sorting Order (Optional)
Choose between original random order, ascending (low to high), or descending (high to low).
Click 'Generate' & Copy Results
Generate results instantly and click 'Copy All' to paste into your spreadsheet or application.
Tips and mistakes to avoid
Fair Giveaways with 'No Duplicates'
When drawing multiple winners from a numbered participant list, enable the 'No duplicates' toggle to ensure each ticket can only be drawn once.
Simulating Multi-Sided Gaming Dice
Set range from 1 to 20 (d20), 1 to 100 (percentile d100), or 1 to 12 (d12) for tabletop roleplaying and gaming decisions.
Check Range Limits for Unique Draws
When 'No duplicates' is enabled, the quantity cannot exceed the total count of integers available within the chosen range (Max − Min + 1).
Avoid : Setting Min Higher Than Max
The minimum value must always be strictly less than the maximum value; the tool will display a validation prompt if reversed.
Avoid : Requesting More Unique Numbers Than Range Capacity
Requesting 50 unique numbers from a range of 1 to 10 is mathematically impossible and will prompt you to expand the range.
Avoid : Relying on Pseudo-Random Math.random for Contests
Standard `Math.random()` can exhibit statistical clustering; Xorvian uses cryptographic hardware entropy for provable fairness.
Frequently asked questions
Answers to the questions people ask about Random Number Generator.
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Updated on August 2026. See all tools