Rolling
Choose how many dice, from 1 to 20, and how many sides each has, then press Roll or tap the dice. The total sits underneath with every die listed, and your last few totals stay beside the button so you can look back.
Fair dice
Each die is drawn from your browser's cryptographic random source, without the small bias that simple methods have, so every face is exactly as likely as every other. The tumble is only for show: the result is decided the moment you press.
Which dice are which
d6 is the usual cube. Role-playing games such as Dungeons & Dragons use the full set: d4, d8, d10, d12 and d20, written as how many and how many sides, so 3d6 is three six-sided dice. d100 gives 1 to 100, for percentile rolls.
Questions
Can I roll with advantage?
Roll 2d20 and keep the higher die; both are listed under the total.
Is anything saved?
No. Rolls stay in this page and are gone when you close it.