Lifehacker wrote a very useful post today about converting documents online. To convert a document simply attach the file and send it to any of the following email addresses.

1. iPhone@pdfonline.com—Converts any attached Microsoft Visio or Word file (including the 2007/.docx kind) to PDF files, and supports multiple file attachments. Ignore the “iphone” in the address, as it works from any device or computer, but only supports files up to 1 MB in size.
2. pdf@koolwire.com—Converts Microsoft Word, Excel or PowerPoint files to PDFs. Like the other Koolwire addresses below, it accepts files up to 10 MB in size.
3. doc@koolwire.com—Convert PDFs to Word or Rich Text Format files.
4. mp3@koolwire.com—Convert WAV files to MP3s.
5. wav@koolwire.com—Convert MP3s to WAV files.

Converted documents will be sent back to you!

Source : http://lifehacker.com/353692/five-email-addresses-that-convert-documents