Random Number Generator

Generate random numbers, roll dice, flip coins, and shuffle lists. Cryptographically secure randomness powered by your browser.

🔢 Number Range

Minimum

Maximum

How many numbers

No repeats (unique numbers only)

🎲 Dice Roller

Number of Dice

Dice Type

🪙 Coin Flip

Click the button to flip a coin. Fair 50/50 odds.

📋 List Randomizer

Enter items (one per line)

Pick how many (0 = shuffle all)

📜 History (last 10)

No results yet

How the Random Number Generator Works

This tool uses the Web Crypto API (crypto.getRandomValues) built into modern browsers to produce cryptographically secure random values. Unlike Math.random(), which uses a pseudo-random algorithm, the Crypto API draws from your operating system's entropy source for higher-quality randomness.

Number Range Mode

Set a minimum and maximum value, then generate one or many random integers within that range. Enable "No repeats" to ensure every number is unique — useful for lottery picks, raffle drawings, or sampling without replacement.

Dice Roller

Simulate rolling standard tabletop RPG dice: d4, d6, d8, d10, d12, d20, and d100. Roll up to 20 dice at once, see each individual result, and get the total. Perfect for D&D, Pathfinder, and other tabletop games.

Coin Flip

A simple, fair coin flip with a visual animation. Each flip is an independent event with exactly 50% probability for heads or tails.

List Randomizer

Paste a list of items (names, tasks, options) and either shuffle them into a completely random order or pick a specific number of random items. Great for random team assignments, drawing winners, or making decisions.

Try our percentage calculator for quick math
Use the tip calculator for splitting bills randomly
Check the date calculator for picking random dates

Frequently Asked Questions

How does the random number generator work?

It uses the Web Crypto API (crypto.getRandomValues) for cryptographically secure random numbers. This provides better randomness than Math.random() and is suitable for games, drawings, and decision-making.

Can I generate random numbers without repeats?

Yes. In Number Range mode, check "No repeats" to generate unique numbers. The count cannot exceed the range size when this option is enabled.

What dice types are available?

The dice roller supports d4, d6, d8, d10, d12, d20, and d100 — all standard tabletop RPG dice. You can roll up to 20 dice at once and see individual results plus the total.

Is the coin flip truly random?

Yes. Each flip uses a cryptographically secure random value, giving an unbiased 50/50 probability for heads or tails. The animation is purely visual.

How does the list randomizer work?

Paste or type items separated by newlines. You can shuffle the entire list into a random order or pick a specific number of random items from it.

Is my data stored anywhere?

No. Everything runs in your browser. No data is sent to any server. The history log is stored only in your current session and clears when you close the page.

Related Tools

More free calculators and utilities.

Percentage Calculator → Date Calculator → Tip Calculator →