How does Random Prime Generator make its random choices?

After deterministic primality enumeration, the eligible prime indexes are chosen with Web Crypto.

Does Random Prime Generator upload my inputs or results?

No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.

When should I use Random Prime Generator?

Use it for math exercises, bounded test fixtures, or examples that need verified small prime numbers.

PRIVATE BROWSER TOOL · PHASE 1

Random Prime Generator

Select prime numbers from a verified bounded interval, with optional no-repeat output. The complete workflow runs locally in this browser, with visible controls and a result you can inspect before copying or downloading.

LOCAL WORKBENCH

Generate a result

No upload · no account · no URL storage

Choose your settings, then select Generate.

How it works

Enumerate primes in the requested interval with a bounded sieve.
Select prime-list indexes uniformly, without replacement when uniqueness is enabled.
Report the eligible prime count so an impossible unique request is explicit.

Worked example

Between 50 and 80, eligible values are 53, 59, 61, 67, 71, 73, and 79.

Limits and interpretation

The maximum endpoint is five million and the selected interval may span at most one million integers.
Unique output cannot exceed the number of primes present in the interval.
This is not a cryptographic key-prime generator and must not be used for key creation.

Privacy

Your inputs and generated results stay in this browser. This tool does not put them in a URL, analytics event, server log, or external request.

Frequently asked questions

How does Random Prime Generator make its random choices?: After deterministic primality enumeration, the eligible prime indexes are chosen with Web Crypto.
Does Random Prime Generator upload my inputs or results?: No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.
When should I use Random Prime Generator?: Use it for math exercises, bounded test fixtures, or examples that need verified small prime numbers.