Generate cryptographically secure random numbers using Web Crypto API. Supports integer ranges, floats, and byte arrays.
Unpredictable numeric output is the point of this generator. It uses the browser's Web Crypto facility to produce whole numbers, floating-point values, or sequences of random bytes according to the selected mode and controls. Generation occurs locally in the browser. The most important distinction is that the entered settings are constraints, not a calculation with one repeatable answer. Running the generator twice with identical settings should normally produce different results, and any particular result remains possible again.
Each generation request uses the browser's Web Crypto randomness facility. There is no user-provided seed to replay. The browser and operating environment are responsible for sourcing the randomness, while the tool presents the returned values in the selected numeric or byte form. The generated material remains in the browser rather than being uploaded to a random-number service.
Integer mode produces whole-number results subject to the entered limits. Floating-point mode produces numeric results that may include a fractional part. Byte-array mode produces the requested count of bytes, each an unsigned value from 0 through 255. These modes describe different result types, so a byte count should not be read as a decimal digit count.
Not by itself in every case. Byte output can provide cryptographically strong random material, but an encryption scheme may require an exact key size, structure, import format, or dedicated key-generation operation. Follow the requirements of the target algorithm or protocol. Do not treat an arbitrary integer, float, or byte count as a valid key.
No. This generator is intended to obtain fresh Web Crypto randomness and does not expose a seed for deterministic replay. Record the generated output if an exact value must be reused. For reproducible tests or simulations, use a seeded pseudo-random generator instead; that requirement differs from generating unpredictable security-oriented values.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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