Dice Roller

1. Pick a die type such as D6 or D20, or choose Custom and enter the number of sides.
2. Set how many dice to roll and, if needed, a modifier that is added to the total.
3. Optionally type dice notation such as 2d6+3; it takes priority over the fields.
4. Press Roll dice. Individual rolls, the modifier and the total appear immediately.
5. Press Reroll to repeat the same roll configuration.

Each die is rolled independently with crypto.getRandomValues(). The tool maps secure 32-bit values onto the die’s range using rejection sampling, so faces such as 1 and 20 on a D20 are exactly as likely as any other face. There is no weighting, smoothing or “balancing” between rolls.

Dice notation is parsed before rolling: 2d8+3 means two eight-sided dice plus a flat +3 modifier. Count and sides are validated, and the modifier is applied to the sum rather than to individual dice. Every roll is appended to the local history with its exact notation, so results can be checked later.

Rolls are executed locally in your browser. Nothing about your dice, modifiers or results is sent to a server, and history can be cleared at any time.

• Attack roll: 1d20 → a single value from 1 to 20, such as 14.
• Damage roll: 2d6+3 → for example dice 4 and 6, total 13 including the modifier.
• Character stats: 4d6 with a −1 modifier → four dice listed individually with the adjusted total.
• Custom die: D30 or any side count from 2 to 10000 for homebrew rules and testing.

• Tabletop role-playing games that need standard or custom polyhedral dice.
• Board games where physical dice are unavailable or have gone missing.
• Classroom probability lessons with visible individual results and totals.
• Prototyping and testing game systems that depend on dice distributions.