Dice Roller & Coin Flip
Guide: How Random Number Generators Work and Why Fair Picks Matter
Nothing you enter or choose here leaves your device. This tool runs in your browser.
How to use
- 1Choose how many dice to roll, from 1 to 6.
- 2Press Roll. For game dice like d20, open Advanced.
- 3Switch to Coin flip for heads or tails.
Frequently asked questions
What is 4d6kh3?
Roll four six-sided dice and keep the highest three. Use kl to keep the lowest.
Is it fair?
Yes. It uses your browser's secure random generator with no bias.
How many dice can I roll?
Up to 100 dice with up to 1000 sides.
Does it keep a history?
It shows your last 15 results until you clear them or leave the page.
Is anything sent to a server?
No. Everything runs in your browser and nothing is sent to us.
Read the guide
Learn how this works and how to get the most from it.
Developer
How Random Number Generators Work and Why Fair Picks Matter
The difference between ordinary and secure randomness, how to pick fairly without repeats, and what dice and coins really do.
2 min read
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