Random Number Generator
Generate truly random numbers using cryptographic randomness. Single numbers, sets, dice, coin flips, and lottery numbers.
Number Generator
Quick Tools
True Random Number Generation
This free random number generator uses window.crypto.getRandomValues() — the same cryptographic-quality randomness used in password generators and security applications. Unlike Math.random() which is pseudorandom, crypto-based generation is truly unpredictable and suitable for games, giveaways, statistical sampling, and security use cases.
Use Cases for Random Number Generation
Board games and tabletop RPGs (dice rolls), lottery and raffle draws, statistical sampling for research, random team selection, deciding tiebreakers, security token generation, teaching probability concepts, and generating test data are all common applications.
Truly Random vs Pseudorandom
Most programming languages use pseudorandom number generators (PRNGs) seeded with the current time — predictable if you know the seed. The Web Crypto API draws entropy from hardware events, making it cryptographically secure and genuinely unpredictable. For anything requiring fairness or security, always use a crypto-quality source.