tabspace

tabspace is a small command line tool that converts tabs to spaces or vice versa. It also removes spaces at the end of a line.

It works with ANSI, UTF-8, and even UTF-16 (on Windows it's mostly just Unicode) files like that.

Conversion is done as that alignment remains the same - the conversion is not simple for replacing characters, but uses an algorithm to figure out how the replacement needs to be done.

You can find the commands on the program page.