Filename Cleaner

Always the ones Windows forbids — < > : " / \ | ? * — and control characters. Optionally # % & { } $ ! ' @ + = and others that cause trouble in URLs and command lines.

CON, PRN, AUX, NUL, COM1–9 and LPT1–9 are reserved device names on Windows, even with an extension. They get an underscore added (CON_.txt).

Accented names are fine on modern systems but can break in older software, some ZIP tools and URLs. é becomes e, ß becomes ss.