Zamzar, a free online file conversion service with sleek and nice interface. They supports conversion between a wide variety of different file formats, and have splitted file formats into four distinct categories - Document, Image, Music and Video Formats, you can see the exact conversion types on offer here.

How it works: The entire process consists of 4 steps:

1. Browse, select and upload your file, that you want to get convert (upto 100 MB is size.)
2. Choose the format to convert to from the dropdown box.
3. Enter your email address to receive converted files.
4. Click Convert button (by clicking you agree to our Terms of Service).

Zamzar keep adding support for new formats all the time - if there's a format that you'd to add, you can contact their support.

Zamzar | Techcrunch

Online, File Conversion, Services