🎲 Random Number Generator
Cryptographically secure random numbers, dice rolls, and coin flips.
History (last 10)
How to Use This Random Number Generator
This tool uses crypto.getRandomValues() for cryptographically secure randomness — the same API used in security applications.
- Number mode: Set your minimum and maximum range, choose how many numbers to generate, and click Generate
- Dice mode: Select dice type (D4–D100) and how many to roll
- Coin mode: Get a random Heads or Tails flip
Use Cases
- Picking raffle or lottery numbers
- Making random decisions fairly
- Board game and RPG dice rolling
- Generating test data for development
- Statistical sampling and simulations
Is It Truly Random?
Yes. This generator uses your browser's built-in cryptographic random number generator (crypto.getRandomValues), which provides high-quality entropy suitable for security-sensitive applications.
Explore more tools that boost your workflow in our AI Productivity Tools Guide.
What Is a Random Number Generator?
A random number generator (RNG) produces numbers that cannot be predicted or reproduced, making them ideal for fair decision-making, games, security, and statistical sampling. Our tool uses your browser's built-in crypto.getRandomValues() API — the same cryptographically secure random source used in encryption and security applications — ensuring truly unpredictable results. Unlike pseudo-random generators that use mathematical formulas, this approach draws from hardware-level entropy sources.
How to Use This Tool
- Select a mode — Choose "Number" for custom range random numbers, "Dice" for tabletop RPG-style dice rolling (D4 through D100), or "Coin" for a simple heads-or-tails flip.
- Configure your parameters — In Number mode, set the minimum and maximum values and how many numbers to generate. In Dice mode, pick the die type and number of dice to roll.
- Generate and review history — Click "Generate" to produce your random result. Previous results are saved in a rolling history of the last 10 generations for reference.
Why Use Our Random Number Generator?
- Cryptographically secure — Uses
crypto.getRandomValuesfor maximum unpredictability, not Math.random(). - Three modes — Custom number ranges, tabletop dice (D4–D100), and coin flips all in one tool.
- Batch generation — Generate up to 100 numbers at once for lists, test data, or sampling needs.
- History tracking — Last 10 results are displayed for easy reference without writing anything down.
Frequently Asked Questions
Is this truly random?
Yes. The browser's crypto.getRandomValues() API uses operating system entropy sources (hardware noise, timing data) to produce cryptographically secure random values that are indistinguishable from true randomness for all practical purposes.
Can I use this for raffles or giveaways?
Absolutely. The cryptographic randomness makes it suitable for fair selections, lottery picks, and random drawings. Each generation is completely independent of previous results.
What's the maximum range I can use?
You can set any integer range where minimum is less than or equal to maximum. The tool handles ranges up to millions without performance issues, generating results instantly.