Random Number Generator
Generate cryptographically random numbers within any range. Includes a dice roller, coin flipper, and lottery number picker.
Custom Number Generator
Quick Tools
Dice Roller
Coin Flipper
Lottery Picker
6 from 1–49
Frequently Asked Questions
How are random numbers generated in this tool?
This tool uses the browser's Web Crypto API — specifically crypto.getRandomValues() — which generates cryptographically secure random numbers. Unlike Math.random() (which uses a deterministic algorithm that can theoretically be predicted), the Web Crypto API draws entropy from hardware-level sources in your operating system, making the output genuinely unpredictable.
Is this random number generator truly random?
Yes. This generator uses a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG) via crypto.getRandomValues(). It is seeded by unpredictable system-level entropy — including hardware events and OS noise pools — and passes standard statistical randomness tests. It is suitable for giveaways, sampling, games, and any application where fairness matters.
How do I pick a random lottery number using this tool?
Use the "Lottery Picker" section — it selects 6 unique numbers from 1 to 49, matching the standard format used in many international lotteries. Click "Pick Numbers" and a fresh, non-repeating set is generated each time. For a different range, use the main generator with a custom min/max and check "No duplicates" to avoid repetitions.