The fastest online randomizer — pick a number from any range,
generate multiple unique numbers with no duplicates, and download as a list.
Our browser-based randomizer uses the Web Crypto API for true randomness.
No download, no account, 100% private.
True Random · No Duplicates · Bulk Generation · Statistics · Free
Enter your minimum and maximum values or click a quick preset to set a common range instantly.
Set quantity, enable no-duplicates for raffles, choose sort order and output separator.
The Web Crypto API generates cryptographically secure random integers in your range instantly.
Copy results to clipboard or download as a .txt file. Use statistics for data analysis.
A random number generator (RNG) produces numbers that cannot be predicted from any previous output. This true random number tool uses window.crypto.getRandomValues() — the browser's Web Crypto API — which draws from the operating system's entropy pool (mouse movements, timing jitter, hardware noise). This is the same cryptographically secure pseudo-random number generator (CSPRNG) used by password managers, TLS encryption and security libraries.
Unlike Math.random() which uses a simple seeded algorithm that is technically predictable, the Web Crypto API produces output that is statistically indistinguishable from true randomness — making this browser-based randomizer suitable for secure random number generator for research, statistical sampling and cryptographic applications.
For each number in the range [min, max], the tool fills a Uint32Array with cryptographically secure bytes, then maps the value to the desired range using modulo arithmetic. For random number generator with no duplicates, it applies the Fisher-Yates shuffle algorithm to the full range array and takes the first N elements — guaranteeing uniform distribution and no repetition.
This random number picker and multiple random number generator is used across many fields:
The best randomizer for giveaways and contests. Set max to your entry count, enable No Duplicates for multiple winners, and screenshot the result for transparency.
Simulate dice rolls (1–6), card draws (1–52), lottery picks (6 of 49) or any game mechanic with fair, unbiased outcomes using the Dice, Card and Lottery presets.
Generate random samples for surveys, A/B test group assignment, Monte Carlo simulations and statistical studies. The statistics panel shows min, max, median, average and sum.
Teachers use this random number picker to randomly select students, assign problems, create quiz questions or demonstrate probability distributions.
Generate random test data, seed values, user IDs or port numbers. The download option makes it easy to pipe large sets of numbers into scripts or spreadsheets.
Create random bracket seedings, assign player numbers or randomise team matchups for fair tournament scheduling with no human bias.
The most common search for this type of tool is pick a number between 1 and 100 — the default preset on this page. Click the 1–100 preset to set the range instantly, then click Generate. For a single result, the large display shows the number prominently. For multiple draws, enable No Duplicates to ensure each number appears only once — useful for classroom draws, prize tiers or statistical samples.
To generate a list of random numbers in a sequence, enter your range, set Quantity to the number of values needed (up to 10,000), choose your separator (one per line, comma, space or tab), and click Generate. Use Sort ascending to generate a random sequence in order. Copy All pastes the entire list to your clipboard; Download saves it as a .txt file ready for Excel, Google Sheets or any data pipeline.
window.crypto.getRandomValues() — the Web Crypto API. It draws from the operating system's entropy pool and is cryptographically secure. Unlike Math.random(), the output is not predictable and passes standard randomness tests, making it appropriate for secure random number generator for research and statistical applications.