Generators
Random Number Generator
Generate truly random numbers with your custom min/max range. Toggle decimals, prevent duplicates, sort results, and export up to 1,000 numbers instantly.
Range & Quantity
Options
Result
10 numbers
Min: 4 · Max: 80 · Avg: 29.40
10 Numbers
crypto.getRandomValues() — not Math.random().True random vs pseudo-random
Most random number generators in programming use pseudo-random algorithms (like Math.random()) that produce deterministic sequences from a seed. This tool uses crypto.getRandomValues() — a cryptographically secure source based on hardware entropy — making the output genuinely unpredictable and suitable for security-sensitive applications.
Use cases for random numbers
- Lottery / raffles: Generate unique numbers in a range with no duplicates.
- Games and simulations: Dice rolls, card draws, RPG encounters.
- Random sampling: Pick N items from a numbered list.
- Testing and development: Generate test data within specific ranges.
- Statistics: Generate random samples for calculations.
The 'no duplicates' algorithm
For integer ranges, the no-duplicates mode uses a Fisher-Yates shuffle on the full range array, then takes the first N values. This guarantees true uniform distribution with no repetition. For decimal numbers, duplicates are exceedingly rare given the precision of floating-point arithmetic.