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About this tool
Roll d4 to d100 dice with modifiers, fair crypto randomness, running stats, and a full roll history.
The Dice Roller rolls up to 10 dice of d4, d6, d8, d10, d12, d20 or d100 with a modifier from −99 to +99 and an optional drop-lowest rule, drawing each result from the browser's crypto.getRandomValues with rejection sampling so no face is even slightly favoured. It shows every individual die, marks natural maximums and natural 1s, and keeps a running average, highest and lowest alongside the last 20 rolls. It is for tabletop players without their dice bag, and for anyone who wants a roll they can show the table.
Open Dice Roller on AltFTool — it loads instantly in your browser.
Pick a Die type from d4 to d100, set Number of dice (1-10) and the Modifier (+/-), and tick Drop the lowest die if you want the 4d6 ability-score roll.
Press the Roll button, which is labelled with the notation you built, or use a Quick rolls preset: 2d6, 3d6, 1d20 or 4d6 drop lowest.
Read the Total with every die face shown and the dropped die greyed out, then use Copy history to take the last 20 rolls in standard notation.
Uses the Web Crypto generator with modulo-rejection sampling, so a d100 is not skewed by the leftover values a plain remainder would introduce.
Displays every die face, which one was dropped, the dice subtotal and the modifier applied, so the total is auditable rather than asserted.
Tracks roll count, average total, highest and lowest, plus a copyable history of the last 20 rolls in standard notation.
Between 1 and 10 dice per roll, in any of the seven standard sizes from d4 to d100, plus a modifier between −99 and +99. Quick presets cover 2d6, 3d6, 1d20 and 4d6 drop lowest.
This one draws from the browser's cryptographic random source rather than Math.random, and discards values in the final partial block so every face has exactly equal probability. That removes the modulo bias that makes naive random-number code slightly favour low faces.
Turn on drop lowest with more than one die and the single lowest result is excluded from the total — the classic 4d6 drop lowest ability-score roll. The dropped die stays visible and greyed out so the table can see what was removed.
Yes — the history keeps the last 20 rolls in standard notation such as 4d6dl+2 with their totals, and copies as plain text you can paste into a virtual tabletop or group chat.