Random Number Generator – Generate Random Online (Free Tool)

Generate random numbers in any range — integers or decimals, with or without duplicates, optionally seeded for reproducibility. Uses the browser's CSPRNG by default so output is cryptographically secure. Handy for lotteries, raffles, dice simulations, sampling, and test-data generation.

• Touch-friendly UI, fine on phones for on-the-go edits
• No registration, account, or installation required
• No API keys to manage and no rate limits to monitor
• No upsell to a paid plan: every feature is free forever
• Designed for everyday quick tasks — open the page, get the answer, move on

1. Set min and max range
2. Set how many numbers to generate
3. Toggle "unique numbers" if you need no duplicates (e.g. lottery)
4. Choose CSPRNG or seeded mode

• Lottery / raffle / giveaway draws
• Statistical sampling from populations
• Game simulations (dice, cards, RNG mechanics)
• A/B test cohort assignment
• Test-data range generation

Same number appears twice when "unique" is off

That's expected — duplicates can occur in random sampling. Toggle "unique numbers" to force no repeats (requires range ≥ count).

"Unique" mode fails with error

You asked for more unique numbers than the range allows (e.g. 10 unique in 1-5). Widen the range or reduce count.

Need reproducible sequence

Switch to seeded mode and enter the same seed — same seed always produces the same sequence (uses xoshiro256** PRNG, not CSPRNG).