Random Number Generator (Crypto-secure)

When to use it

• Lottery: pick 6 numbers from 1-45 with no duplicates (Lotto preset ready).
• Games: dice rolls, coin flips, board games.
• Test PIN / OTP: 4-6 digit codes for UI testing.
• Data sampling: pick N random rows from a database.
• A/B testing: assign users to groups randomly.

Crypto-secure vs seeded

• Empty seed = uses crypto.getRandomValues — TRUE random from OS entropy. Not reproducible. Use for lottery, passwords.
• With a seed = uses Mulberry32 PRNG. Same seed → same numbers. Use for reproducible test data, simulations.

Tips

• Unique: turn on for lottery — guarantees no duplicates.
• Sort: ascending — easier to read when picking many numbers.
• Decimals: turn off "Integers only" for fractional numbers (coordinates, percentages).