Dice Roller

How do I roll dice online for D&D or board games?

Open AnyTool Dice Roller, add the dice you need (d4, d6, d8, d10, d12, d20, d100) with a quantity per type and an optional +/− modifier, then press Roll or the spacebar — the dice tumble and settle on values decided by your browser’s crypto-secure randomness for fair, unbiased rolls. You can also type standard RPG notation like “3d6+2”, “2d8-1” or “4d6kh3” (keep the highest 3), and a d20 supports 5e advantage or disadvantage. Every die, the per-group subtotals, the grand total and a roll history are shown. Nothing is uploaded.

Crypto-fair rolls (Web Crypto, no modulo bias) — never Math.random
Standard dice d4, d6, d8, d10, d12, d20, d100 with a quantity per type
RPG notation: 3d6+2, 1d20, 2d8-1, 4d6kh3 (keep highest/lowest), modifiers
d20 advantage / disadvantage (roll 2d20, keep highest / lowest)
Animated tumble, every die + subtotals + total, roll history · 100% in your browser

What is

Dice Notation (NdS+M)

Dice notation is a compact algebra for tabletop dice: NdS means “roll N dice with S sides” and an optional +M or −M adds or subtracts a flat modifier — so 3d6+2 rolls three six-sided dice and adds 2. Keep/drop suffixes like kh (keep highest) and kl (keep lowest) select a subset, as in 4d6kh3, and rolling 2d20 keeping the higher or lower result is D&D 5e advantage or disadvantage.

Generators

Related terms

Polyhedral diceModifierKeep highest / lowestAdvantage & disadvantageCrypto-secure random

Frequently Asked Questions

AnyTool Dice Roller draws each die from the browser’s Web Crypto API (crypto.getRandomValues) using rejection sampling, so a d20 gives every number from 1 to 20 exactly a 1-in-20 chance with no modulo bias — it never uses the predictable Math.random. Unlike a physical die, there is no wear, weighting or “loaded” bias, which makes it a fair stand-in for tabletop RPGs and board games when you have lost your dice.

Yes. AnyTool rolls each die with crypto-secure randomness (Web Crypto) using rejection sampling, so every face is exactly equally likely with no bias.

The roller parses standard RPG dice notation. NdS rolls N dice of S sides; an optional +M or −M is a flat modifier (3d6+2 = three d6 plus two). You can combine terms (2d6+1d4+3), use d% for a d100, and apply keep/drop suffixes: kh keeps the highest, kl the lowest, dh drops the highest and dl drops the lowest — so 4d6kh3 (the classic ability-score roll) keeps the best three of four d6. Rolling 2d20kh1 is mechanically advantage, and 2d20kl1 is disadvantage.

You can type NdS+M notation — e.g. 3d6+2, 1d20, 2d8-1 — plus keep-highest/lowest like 4d6kh3 and 2d20kh1 for advantage.

In D&D 5e, advantage means you roll two d20s and use the higher result before adding your modifier, and disadvantage uses the lower. AnyTool Dice Roller has a Normal / Advantage / Disadvantage toggle that appears whenever your pool includes a d20: it rolls 2d20, shows both dice with the kept one highlighted, and adds your modifier to the chosen value. Per 5e, advantage and disadvantage do not stack and cancel each other out if you have both.

Advantage rolls two d20s and keeps the higher; disadvantage keeps the lower. Toggle it on any d20 and the kept die is highlighted.

AnyTool Dice Roller runs entirely in your browser. The random rolls, your dice pool, any notation you type and the roll history are computed locally and are never sent to a server, logged, or saved — close the tab and everything is gone. There is no account, no tracking and no upload, and the page works offline once cached. An optional dice rattle is synthesized with the Web Audio API (no audio files) and only plays when you turn sound on.

No. Every roll, dice pool, notation and the history stays in your browser — nothing is uploaded, logged or stored, and no sign-up is needed.

Roll fair, animated virtual dice (d4–d100) with RPG notation, modifiers, keep-highest/lowest and d20 advantage/disadvantage — crypto-random, entirely in your browser, nothing uploaded.

Features

Crypto-secure rolls (Web Crypto, rejection sampling, no bias)
Standard dice d4, d6, d8, d10, d12, d20, d100 with a quantity per type and modifier
RPG notation parser: 3d6+2, 2d8-1, 4d6kh3, d% and combined terms
d20 advantage / disadvantage (2d20 keep highest / lowest)
Animated tumble, every die + subtotals + total, roll history — 100% client-side

PriceFree

CategoryGenerator

PlatformAll (browser-based)

PrivacyRolls, pools, notation and history are computed locally and never leave your device

Input: Pick dice + modifier, or type notation like 3d6+2 / 4d6kh3

Output: Each die value (pips for d6), Per-group subtotals & grand total, Roll history

Detailed Explanation

Methodology

How the Dice Roller Rolls Each Die

AnyTool Dice Roller rolls every die in the browser using the Web Crypto API. A die of S sides is produced as secureRandomInt(S) + 1, where the integer in [0, S) comes from crypto.getRandomValues via rejection sampling — values that would fall outside an even multiple of S are discarded — so there is no modulo bias and every face is exactly equally likely. Math.random is never used. Build a pool of mixed dice (d4, d6, d8, d10, d12, d20, d100) with a quantity per type and a flat +/− modifier, or type standard dice notation that an in-page parser turns into signed terms and rolls. Each roll plays a short CSS tumble animation, then shows every individual die (pips for a d6, the number for others), per-group subtotals and the grand total.

Each die = secureRandomInt(sides) + 1 from crypto.getRandomValues (CSPRNG)
Rejection sampling removes modulo bias — every face is exactly equally likely
Math.random is never used for any roll
Mixed dice pools (d4–d100) with quantity per type and a flat modifier
All rolls run client-side — no server round-trip

Use Cases

Dice Notation, Keep/Drop and Advantage

The roller parses standard tabletop dice notation. NdS rolls N dice of S sides; an optional +M or −M is a flat modifier, so 3d6+2 rolls three six-sided dice and adds two, and 2d8-1 rolls two d8 and subtracts one. Terms can be combined (for example 2d6+1d4+3) and d% is treated as a d100. Keep/drop suffixes select a subset: kh keeps the highest, kl the lowest, dh drops the highest and dl drops the lowest — 4d6kh3 is the classic D&D ability-score roll (keep the best three of four d6, equivalent to 4d6dl1). For a d20, a Normal / Advantage / Disadvantage toggle rolls 2d20 and keeps the higher (advantage) or lower (disadvantage) value before adding the modifier, exactly as in D&D 5e; per the rules these never stack and cancel out if you have both.

NdS+M notation: 3d6+2, 1d20, 2d8-1, combined terms and d% (d100)
Keep/drop: kh (keep highest), kl (keep lowest), dh, dl — e.g. 4d6kh3
Advantage = 2d20 keep highest; disadvantage = 2d20 keep lowest (5e)
Dropped dice are shown but excluded from the subtotal
Shows every die, per-group subtotals, the grand total and a roll history

Privacy & Security

Independence, Fairness and Privacy

Each die is an independent event: a d20 gives every value from 1 to 20 a 1-in-20 chance on every roll, and past results never change the next — so a run of low rolls does not make a high number “due” (the gambler’s fallacy). Summing several dice (like 3d6) produces a bell-curved total that clusters near the middle, which is expected probability rather than bias. Because everything runs in the browser, no roll, dice pool, typed notation or history is sent to a server, logged or stored — closing the tab discards it, and the page works offline once cached. An optional dice rattle is synthesized with the Web Audio API (no audio files are downloaded) and only plays when sound is turned on.

Every die is independent — no number is ever “due” (gambler’s fallacy)
Multi-die totals are bell-curved (expected probability, not bias)
No uploads, logging or storage — rolls and history stay in the browser
Works offline after first load (PWA-cached); free, no account, no tracking
Optional dice rattle synthesized via Web Audio — no audio files

Dice roller: in-browser (AnyTool) vs typical online dice tools
Capability	AnyTool	Typical online dice tools
Randomness	Web Crypto CSPRNG, rejection sampling (no bias)	Often Math.random
Processing	Runs in your browser	Sometimes server-side
Dice types	d4, d6, d8, d10, d12, d20, d100, quantity per type	Often a fixed set
RPG notation	3d6+2, 2d8-1, 4d6kh3, d%, combined terms	Often basic or none
Advantage/disadvantage	2d20 keep highest / lowest toggle (5e)	Frequently missing
Results detail	Every die, per-group subtotals, grand total	Often just a total
History	Full roll-history log with breakdown	Often limited or none
Privacy	Never uploaded, not stored, works offline	May transmit or log
Cost / signup	Free, no signup	Often ad-heavy or gated

AnyTool rolls every die locally with crypto-secure randomness for fair, unbiased results and uploads nothing.

Cite This Page

Title: Dice Roller (fair, animated virtual RPG dice with crypto-random rolls, dice notation, modifiers and d20 advantage/disadvantage)
Author: AnyTool
Published: January 1, 2026
Modified: February 8, 2026
Section: Generators
URL: https://www.anytool.tech/dice-roller

Formatted Citation

AnyTool. "Dice Roller (fair, animated virtual RPG dice with crypto-random rolls, dice notation, modifiers and d20 advantage/disadvantage)." AnyTool, January 1, 2026. https://www.anytool.tech/dice-roller

A privacy-first, 100% client-side virtual dice roller for tabletop RPGs and board games that rolls every die with the Web Crypto API (crypto.getRandomValues) as secureRandomInt(sides) + 1 using rejection sampling, so each face is exactly equally likely with no modulo bias — never Math.random. Build a pool of mixed polyhedral dice (d4, d6, d8, d10, d12, d20, d100) with a quantity per type and a flat +/− modifier, or type standard RPG dice notation such as 3d6+2, 1d20, 2d8-1, combined terms and d%, plus keep/drop suffixes kh, kl, dh and dl (4d6kh3 keeps the best three of four d6). A d20 supports D&D 5e advantage and disadvantage by rolling 2d20 and keeping the higher or lower value before the modifier. Each roll plays a short CSS tumble animation and then shows every individual die (pips for a d6, the number for others), per-group subtotals, the grand total, an optional synthesized dice rattle (Web Audio, no files) and a full roll-history log with breakdown. Rolls, dice pools, notation and history are computed locally and are never uploaded, logged or stored, and the tool works offline once cached. Honestly, every die is an independent event — past results never change the next, so no number is ever “due” (the gambler’s fallacy) — and there is no physical wear or weighting; summing several dice gives a bell-curved total that clusters near the middle, which is expected probability rather than bias.