CloudConvert is currently a beta service allows you to easily convert from a variety of formats (DOCX to ODT, PNG to JPG, EOT to TTF, etc.). The site also gives you a brief overview of the format(s) you are trying to convert, and you can save the converted files to your Google Drive, Dropbox, and OneDrive (or email). It also has a Google Drive app.
https://cloudconvert.com/
Pretty good for a beta service, if you ask me.