Free Cryptographically Secure Random Number Generator
Generate true random numbers securely offline natively with the Web Crypto API.
What does this tool do? Generate truly random numbers within any range you specify. Uses your browser's built-in cryptographic randomness, making it suitable for lotteries, games, and security-sensitive applications.
Uses cryptographic randomness (CSPRNG)
View Technical Specifications (For Developers)
- CSPRNG: Uses
crypto.getRandomValues()— notMath.random() - Range Mapping: Uniform distribution via modular arithmetic on cryptographic bytes
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Generated using window.crypto.getRandomValues() — cryptographically secure
Fuel the Project
Free tools, zero server uploads, total privacy.