Media-Convert
۩ 100% Free online file conversion
۩ No installation, no virus and spywares
۩ Fast realtime processing

Media-Convert is 100% free. No software is needed, and you don't have to register. You only need your favorite Internet browser. Your files are ready 7/7 days 24/24 hours.

A lot of formats are supported. Main formats are :

• Movie, Image, Sound (see website)
• Raw text, HTML, XHTML, Microsoft Word, RTF, PDF, PS, Open Office, Star Writer, Pocket Word, Word Perfect
• CSV, dBase, Microsoft Excel, Pocket Excel, Lotus 123, Quattro Pro, Star Calc, Open Office spreadsheet
• MathML, Star Math, Open Office math
• Microsoft Powerpoint, Star Impress, Open Office presentation

http://media-convert.com/convert/

Zamzar supports conversion between a wide variety of different file formats.

۩ Document formats
۩ Image formats
۩ Music formats
۩ Video formats

"We're adding support for new formats all the time - if there's a format that you'd like us to support why not contact us and we'll do our best to add it."

http://www.zamzar.com/