Generate a random number with a specified number of digits from 1 to 20.
Need a truly random number for a giveaway, a test, or a decision? Specify exactly how many digits you need (up to 20) and get your number instantly. You can also enable 'Unique digits' (for 10 digits or fewer) to ensure no number is repeated. Unlike standard calculators, this tool handles massive numbers with total precision, ensuring that a 15-digit request always returns exactly 15 digits.
Enter the desired number of digits (1-20) and click Generate. For 10 digits or fewer, you can check 'Unique digits' to ensure every digit is different. The random number appears instantly below. Click Copy to save it to your clipboard.
It uses JavaScript's Math.random(), which is suitable for most general-purpose uses, giveaways, and games. For high-security cryptographic needs, a hardware-based generator is recommended.
A number must have at least one digit to exist!
When enabled (available for 10 digits or fewer), this ensures that every digit in the generated number is different. No digit will be repeated.
This tool runs entirely in your browser. Nothing you type or paste is sent to any server — all processing happens locally on your device.