How to Use an Online Dice Roller: Step-by-Step Guide

To roll dice online, choose a die preset (d4, d6, d8, d10, d12 or d20) or type a custom number of sides, set how many dice to roll, and click Roll to see each face plus the combined total instantly. The ByteTools Dice Roller does this with fair, cryptographically secure randomness, entirely in your browser. This guide walks through each step and the settings that matter.

A virtual roller is handy when physical dice go missing, when you need a d20 for Dungeons & Dragons, or when you just want an honest way to settle a decision. Here is exactly how to drive it.

Step 1: Pick your die

Start by choosing the die type. The presets cover the standard polyhedral set:

• d4 — four sides, common for low damage rolls.
• d6 — the classic cube, shown with familiar pip faces.
• d8, d10, d12 — mid-range polyhedral dice for RPGs and games.
• d20 — the iconic twenty-sider for attack rolls and checks.

Need something unusual like a d100 or a d3? Type any custom number of sides and the roller adapts.

Step 2: Set how many dice

Enter the number of dice you want to roll together. Rolling 3d6 for a stat, or a handful of dice for damage, happens in a single click — you get every individual result and the combined total, so there is no adding up by hand.

Step 3: Roll and read the results

1. Click Roll to generate the outcome.
2. Read each die face; a d6 shows classic pips, while dice with more sides show the number.
3. Check the total for multi-dice rolls.
4. Copy the results, or roll again as many times as you like.

Settings and formats at a glance

You want	Setting	Example
A single attack roll	d20, 1 die	Roll → 17
Ability scores	d6, 3 dice	4 + 5 + 2 = 11
Percentile roll	Custom 100 sides	Roll → 73
Coin-flip-style choice	Custom 2 sides	Roll → 1 or 2

Why the rolls are fair and private

The roller uses crypto.getRandomValues, your browser's cryptographically secure random source, together with rejection sampling to remove modulo bias — so every face has exactly the same chance, just like a well-balanced physical die. Everything runs on your device with no server calls, which means nothing is uploaded or tracked, and the roller keeps working offline once the page has loaded, including as an installed app.

Try the Dice Roller — free and 100% in your browser.

FAQ

How do I roll a d20 for D&D?

Select the d20 preset, leave the number of dice at 1, and click Roll. The result from 1 to 20 appears immediately, ready for your attack roll or ability check.

Can I roll a die that isn't a standard shape?

Yes. Type any side count in the custom field — a d3, d30, d100 or anything else — and the roller treats it as a fair die with that many faces.

How do I get the total of several dice?

Set the number of dice above one before rolling. The tool shows each die separately and adds them into a combined total automatically.

Do I need an internet connection to roll?

No. After the page loads, the roller works fully offline because all the logic runs in your browser with no server round-trips.

Related free tools

• Coin Flip — a fair two-sided decision.
• Random Number Generator — pick a number in any range.
• Yes or No Generator — settle a quick question.
• Random List Picker — choose from a list at random.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio building web apps, SaaS and custom software. If you have an idea that needs real engineering, explore what ByteVancer can build with you.