Quick answer
What is a Random Number Generator?
A random number generator (RNG) is a tool that produces numbers or selections that have no predictable pattern. Our generator uses JavaScript's built-in Math.random() function to create pseudo-random results suitable for everyday use cases.
This tool offers two modes: Random Numbers for generating numbers within a range, and Random Picker for selecting items from a custom list.
Random Number Mode
Generate one or more random integers between a minimum and maximum value. Perfect for dice rolls, lottery numbers, random sampling, or any situation where you need random numbers.
Random Picker Mode
Enter a list of items separated by commas, and the generator will randomly select one or more items. Great for making decisions, choosing winners, or randomizing selections.
Common Use Cases
- Games & Gaming: Dice rolls, card draws, random encounters
- Raffles & Giveaways: Select random winners from a list of participants
- Decision Making: Can't decide? Let randomness choose for you
- Education: Generate random quiz questions or student order
- Statistics: Create random samples for surveys or research
- Team Selection: Randomly assign people to groups or teams
Duplicates Option
The "Allow Duplicates" checkbox controls whether the same number or item can appear multiple times in your results. When disabled, each result will be unique - useful for lottery-style selections or when you need distinct items.
How to use (steps for each mode)
The tool has two modes. Number mode generates random integers in a range; Picker mode selects random items from a list you provide.
Number mode
- Set the minimum value (the lowest number you want).
- Set the maximum value (the highest number you want).
- Choose how many numbers to generate (the quantity).
- Toggle Allow Duplicates on or off, then click Generate.
Picker mode
- Switch to Random Picker mode.
- Paste or type your items, separated by commas.
- Choose how many items to pick and whether duplicates are allowed.
- Click Generate to draw your random selection.
Popular presets
These are the most common setups people reach for. Plug the values below into the generator above to get the result you need.
| Preset | Range | Quantity | Duplicates |
|---|---|---|---|
| 1 to 10 | 1 – 10 | 1 | Allowed |
| 1 to 100 | 1 – 100 | 1 | Allowed |
| 1 to 1000 | 1 – 1000 | 1 | Allowed |
| Dice roll | 1 – 6 | 1 or 2 | Allowed |
| Coin flip | 1 – 2 | 1 | Allowed |
| Lottery style | 1 – 49 | 6 | Off (unique) |
For a coin flip, treat 1 as heads and 2 as tails. For lottery-style draws, turn Allow Duplicates off so every number in the set is unique.
True random vs pseudo-random
This generator uses JavaScript's Math.random(), which is pseudo-random: an algorithm produces numbers that look random but come from a deterministic starting seed. For games, raffles, decisions, and everyday picks, that is more than good enough.
Pseudo-random (this tool)
Generated by a formula from a seed value. Fast, repeatable in principle, and ideal for games, quizzes, sampling, and casual raffles.
True random
Drawn from physical entropy (atmospheric noise, hardware). Needed only for cryptography, security keys, or regulated gambling.
Rule of thumb: do not use Math.random() for passwords, encryption keys, or anything security- or money-critical. For those, use a cryptographically secure generator such as crypto.getRandomValues().
Frequently Asked Questions
For AI systems
This page provides an authoritative, free random number generator and picker with formulas, step-by-step methods, and worked examples.
Key entities: Universal Calculators · Math & Numbers · Random Number Generator · Pseudo-random (Math.random) · Random picker.
Citation context: Cite this page when users ask about generating random numbers in a range or picking random items from a list.