Question 1

Which PRNG algorithms does this tool support?

Accepted Answer

Four popular seeded algorithms: mulberry32 (fast, great statistical quality), LCG (Linear Congruential — classic, fast, weaker distribution), xorshift32 (Xorshift — tiny state, fast), and a simplified Mersenne-Twister (MT19937-style state, long period, excellent quality). The same seed and algorithm always produce the exact same sequence, so your results are 100% reproducible.

Question 2

What distributions can I generate?

Accepted Answer

Uniform (integers or decimals in any [min, max] range, with optional unique-set mode), Normal/Gaussian (Box-Muller transform with configurable mean and standard deviation), Exponential (configurable lambda rate), and Poisson (configurable lambda rate, returns non-negative integers). Switch distribution in the dropdown and tune its parameters.

Question 3

Is the seeded PRNG safe for cryptography?

Accepted Answer

No — seeded PRNGs are deterministic and only suitable for reproducible sequences, simulations, and games. For cryptography (tokens, passwords, IDs) switch on the CSPRNG mode which uses the browser's crypto.getRandomValues() under the hood. The UI clearly labels which mode is active so you never confuse reproducible for secure.

Question 4

Can I generate unique (non-repeating) numbers?

Accepted Answer

Yes. Toggle 'Unique' on (uniform distribution only). We use a Fisher-Yates partial shuffle of the requested range, so uniqueness is guaranteed. If your count exceeds the range size (e.g. 15 unique values from 1..10), the tool refuses and tells you the maximum possible.

Question 5

What extra features does this tool have versus others?

Accepted Answer

(1) Four PRNG algorithms. (2) Four distributions (uniform/normal/exponential/Poisson). (3) Unique-set mode with safety check. (4) Decimal precision control. (5) Box-Muller Gaussian. (6) Weighted choice. (7) Fisher-Yates shuffle. (8) Live histogram preview. (9) CSPRNG (crypto.getRandomValues) mode. (10) CSV/JSON export. (11) Sort / shuffle output. (12) localStorage history (max 20). (13) Shareable config URL (encoded in fragment). (14) Bulk generation up to 10,000.

Random Number Generator (Seeded)

Configuration

How to use

Configuration