How random are the generated numbers and strings?
This tool uses crypto.getRandomValues, the Web Crypto API's cryptographically secure random source built into your browser, rather than Math.random, for genuinely unpredictable results.
Generator
Random Number / String Generator
Generate random numbers in a range or random strings with custom character sets. Everything runs locally in your browser.
FAQ
Random Number / String Generator FAQ
Can I generate numbers without repeats?
Yes. Enable "No repeats" in Number mode to get unique values from your chosen range — the range must contain at least as many values as the quantity you request.
Can I customize which characters appear in random strings?
Yes. In String mode, choose any combination of uppercase, lowercase, numbers, and symbols, or add your own custom characters to include.