Where does the randomness come from?
Short PINs (4-6 digits) have a small enough search space that predictability in how they're generated matters as much as their length: a PIN drawn from a weak or seeded PRNG can be far more guessable than its digit count implies.
This tool reseeds your browser's CSPRNG with physical entropy from Galactropy's SDR radio-noise pool before drawing each digit, so the sequence isn't tied to a predictable algorithmic seed.
⚠ Cryptographic notice
A PIN alone is rarely your only defense: pair it with rate-limiting or lockout on the receiving system, and never reuse the same PIN across unrelated accounts or devices.