DocsPal is a free online file converter. You simply upload your file, select the original file format and what you want it converted to, and click convert. The link to the converted file will appear on the screen. You can also have the link sent to you via email.
I converted an Excel spreadsheet with graphs to PDF format in about 15 seconds.
It is still in Beta and only supports about 30 file formats, but more are being worked on.
This is great for educators who use one type of software or operating system at school and different ones at home or have students using different systems.