This site uses Dice Strings to generate rolls! Here are the various commands you may use, and examples of each:

To roll a die or any number of dice, you'll need to enter a Dice String in the format of roll X dice with Y sides

3d20 rolls 3x 20-sided dice, and displays the results of each dice plus the total

3d20 + 5 rolls 3x 20-sided dice, and displays the results of each dice plus the total plus an additional 5

This will keep the highest X dice in the roll

3d20k2 rolls 3x 20-sided dice, and keeps the 2 dice with the highest rolls (dropping the lowest die)

This will drop the lowest X dice in the roll

3d20d2 rolls 3x 20-sided dice, and keeps the die with the highest roll (dropping the lowest 2 dice)

This modifies the K/D commands to Keep or Drop the X Highest dice in the roll

By default, the Keep command uses Highest

3d20dh2 rolls 3x 20-sided dice, and keeps the die with the lowest roll (dropping the highest 2 dice)

3d20kh2 rolls 3x 20-sided dice, and keeps the 2 dice with the highest rolls (dropping the lowest die.)

This modifies the K/D commands to Keep or Drop the X Lowest dice in the roll

By default, the Drop command uses Lowest

3d20dl2 rolls 3x 20-sided dice, and keeps the die with the highest roll (dropping the lowest 2 dice)

3d20kl2 rolls 3x 20-sided dice, and keeps the 2 dice with the lowest rolls (dropping the highest die.)

Clear local history. This will give you a clean slate, and may resolve problems with the site.