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Random Number Generator (Crypto-secure)

Generate random numbers 1-10,000 using crypto.getRandomValues or a seeded PRNG (mulberry32). 6 presets: dice, coin, lotto, PIN. Unique + sort options.

All tools

Presets

Min

Max

Count

Integers only Decimal places: Unique (no duplicates) Sort ascending

Seed (for reproducibility)

Output

Generate random numbers using crypto.getRandomValues (secure) or seeded PRNG (reproducible). Great for lotteries, dice, test data.

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).