Choose the kind of random result you need
Select random integers, random decimals, unique integers, shuffle list, dice rolls or coin flips. Enter How many for draw modes; use the comma-separated item box for a shuffle. Minimum and maximum set the range for number modes. Dice sides sets the number of equally likely faces. The seed is a whole number from 0 to 4,294,967,295: keep it with the mode and other inputs to reproduce a result later.
Bounds, repeats and the generation method
Integer bounds include both endpoints. From 1 through 6 there are six possible results, and ordinary integer draws can repeat. Decimal draws include the minimum but exclude the maximum. Unique integers are sampled without replacement, so each selected number appears once. A Fisher–Yates shuffle changes the order of entered items; if two entered items have the same label, those labels remain duplicated. Dice and coin modes simulate separate draws, with repeated faces or sides allowed.
Worked example you can reproduce
Choose Random integers, How many 6, Minimum 1, Maximum 6, and Seed 12345. The sequence is 6, 2, 3, 5, 4, 3. The repeated 3 is valid because this mode uses replacement. Keep the bounds and seed but choose Unique integers with a count of 6: every integer from 1 through 6 appears once, in a generated order. A unique count of 7 is rejected because only six integers are available.
Interpretation and limits
This is deterministic pseudorandom output. Recalculating with the same inputs and seed gives the same sequence; change the seed for another reproducible sequence. A short run need not look balanced: a simulated fair coin can show several heads in a row. These outputs are illustrative simulations, not evidence about actual dice or coins. Draw counts are limited to 1–1,000, integer bounds must span at most 10 million, maximum must exceed minimum, and a shuffle needs 2–1,000 nonblank items. Dice may have 2–1,000 sides.
The generator is not cryptographically secure. Do not use it for passwords, secrets, high-stakes allocation or a regulated draw. The NIST reference below describes security requirements for deterministic random generators; this classroom tool does not claim to implement that standard.
Method reference
NIST SP 800-90A: deterministic random bit generators provides context for the distinction between reproducible simulation and security-grade randomness.
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