Best way to convert text files between character sets?

Question

What is the fastest, easiest tool or method to convert text files between character sets?

Specifically, I need to convert from UTF-8 to ISO-8859-15 and vice versa.

Answer 1

Try Notepad++

On Windows I was able to use Notepad++ to do the conversion from ISO-8859-1 to UTF-8. Click "Encoding" and then "Convert to UTF-8".