Numeric codes with clear rules—and a clear view of their limits.
A short PIN has limited entropy. Use it only with enforced attempt limits and an appropriate lifetime.
Changing an option replaces the current results. Nothing is saved or sent.
Downloads may contain secrets. Protect the file and only export when needed.
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Four unconstrained digits have exactly 10,000 possibilities—about 13.3 bits. Six digits have a million, about 19.9 bits. These are code spaces, not strong standalone passwords. A device or service must limit failed attempts; generation alone cannot provide that protection.
Turn off leading zero when the receiving system treats a code as a number. No-repeat mode permits at most ten digits. Sequence exclusion removes any contiguous ascending or descending run of three digits, such as 123 or 654. It does not wrap around: 890 is allowed. Repeated patterns such as 1212 are also allowed unless the separate no-repeat rule prohibits them.
The generator counts valid completions for each partial PIN, then draws each next digit in proportion to that count. This avoids favoring a digit just because it has fewer legal continuations. The possibilities shown are the exact count under your settings, and entropy is its base-two logarithm. Excluding patterns reduces the search space; it does not magically strengthen a short PIN.
Batch mode produces independent PINs, so duplicates can occur. It does not promise unique PINs. For unique numeric selections use the random number generator, noting that numeric output does not preserve leading zeros.
Your bank defines its own enrollment process and allowed codes. This tool only generates candidate values locally; it cannot register or change a PIN.