Random Number Generator - Free & Fair
Need a random number for a game, drawing, lottery, or decision? This generator produces truly random numbers within any range - no bias, no repeats unless you want them. Includes dice rolls, coin flips, and pick-from-list.
What This Tool Does
- Generate random integers in any range
- Roll 1-10 dice (any number of sides)
- Flip coins (1-1000 at once)
- Pick a random item from a list
- Generate unique numbers (no repeats)
Randomness - True vs Pseudo
True randomness requires physical entropy (atmospheric noise, radioactive decay). Pseudo-random number generators (PRNGs) use mathematical algorithms that are statistically indistinguishable from true randomness for practical use. This tool uses the browser's crypto.getRandomValues(), which is cryptographically secure.
How to Use This Tool
- Choose the type of random output (number, dice, coin, list)
- Set the range or options
- Choose how many results you want
- Toggle "unique" to prevent repeats
- Click Generate
Common Uses
- Lottery or raffle drawings
- Board game dice rolls
- Random sampling for surveys
- Classroom activities
- Statistical simulations
- Decision-making when you cannot choose
- Password or PIN generation
Frequently Asked Questions
Are the numbers truly random?
They use the browser's cryptographic random number generator (crypto.getRandomValues), which is cryptographically secure and statistically indistinguishable from true randomness.
Can I generate unique numbers?
Yes - toggle "unique" mode to prevent duplicates in your output.
What is the largest range I can use?
Up to 2^53 - 1, though practical limits are well below that.
Can I generate dice rolls?
Yes - D4, D6, D8, D10, D12, D20, and any custom-sided die.
Are these suitable for passwords?
Not recommended for passwords - use a dedicated password manager with 128+ bits of entropy.
Is the generator biased?
No - it uses the Web Crypto API, which is unbiased even for very large ranges.