A d20 roller built for tabletop checks: normal, advantage or disadvantage, a modifier, and an optional target DC. Natural 20s and natural 1s are highlighted and counted.
Set your modifier and, if you like, the difficulty class the DM called for, then roll. With advantage two d20s are rolled and the higher is used; with disadvantage, the lower. The die that was dropped is dimmed so the roll is easy to check.
The result shows your total and, if you entered a DC, whether you succeeded. Natural 20s glow green and natural 1s red. Many tables treat these as critical hits and fumbles for attacks, so the tool flags them rather than deciding for you.
Need other dice? The dice roller does any pool, and the ability score roller builds a full character set.
Frequently asked questions
How does advantage work?
You roll two d20s and take the higher result. Disadvantage takes the lower.
What is a DC?
The difficulty class: the number your total must meet or beat to succeed.
Does a natural 20 always succeed?
In D&D 5e a natural 20 is automatically a hit only on attack rolls. For ability checks it is not an automatic success, so the tool still compares your total to the DC and flags the natural 20.
Can I use negative modifiers?
Yes. Enter a negative number in the modifier box.
Is it random?
Yes, each die uses your browser's secure random generator.