Random Number Generator
Generate cryptographically secure random numbers
Random Number Generator is a free online tool from BrowserUtils that generate cryptographically secure random numbers. It runs entirely in your browser — your data never leaves your device. No account required.
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How to use Random Number Generator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Random Number Generator
Free online random number generator. Generate one or more random numbers within a configurable range using cryptographically secure randomness. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Random Number Generator specs
- Runtime
- 100% client-side (browser)
- Built on
- Web Crypto API (SubtleCrypto) for hashing and crypto.getRandomValues for secure randomness
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
Are these numbers truly random?
Yes. This tool uses crypto.getRandomValues() which provides cryptographically secure pseudo-random numbers, suitable for security-sensitive applications.
Can I generate decimal numbers?
Yes. Toggle the decimal option to generate random floating-point numbers within your specified range.
Can I use this for lottery or raffle drawings?
Yes, the cryptographically secure random number generation makes this suitable for fair drawings where unbiased randomness is required.
What is the difference between Math.random() and crypto.getRandomValues()?
Math.random() uses a predictable algorithm and is not suitable for security. crypto.getRandomValues() uses the operating system entropy source and produces unpredictable output safe for cryptographic purposes.
Does the random number generator work offline?
Yes, numbers are generated entirely in your browser using the Web Crypto API. No internet connection or server is needed.
Can I generate random numbers within a specific range?
Yes, set the minimum and maximum values and the tool will produce uniformly distributed random numbers within that range, including both endpoints.
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