Number Base Converter

A single leading minus is the only sign. Whitespace is not a digit: remove it rather than expecting trimming. No plus sign, decimal point, exponent notation, digit separators or prefix inference is supported. For example, 0xFF is invalid in base 16; letters such as E are ordinary digits when the selected alphabet allows them. Leading zeroes canonicalize, and negative zero becomes zero.

Custom alphabets contain 2–62 unique printable ASCII symbols, are case-sensitive, and exclude whitespace, controls and the reserved symbols +, - and . . Their length defines the base; their symbol order defines digit values. Alphabets are processing preferences retained by Clear.

Limits are measured in UTF-16 code units: at most 1,024 magnitude digits plus one optional minus, 62 symbols per alphabet, and 16,384 output characters. Native ceilings are 1,027 and 64 characters; a large paste may clip before transport but is refused, never converted as an accepted prefix. Oversized edits clear the affected field and stale result/Copy; shorten and re-enter that field or Clear. Ordinary browser input bounds do not certify hostile programmatic assignments or every IME.

No payload persistence or logging is added. Interactive Auto server events traverse the Blazor connection; WebAssembly executes on-device. Copy explicitly writes the result to your clipboard. Website discovery is active; extension and Android flags are inactive, not hard route denial.