Just a cool link I had to share: Cometdocs.
Comet Docs is almost able to convert from any format to any other format. And it’s all free and online.
It can read/write from/to audio files, text files, HTML, PDF, spreadsheets… it can recode a text file into any characters set, it can determine files formats, etc.
This is that kind of link you should keep in your bookmarks because sooner or later, we all need some tool like that one.