This website come with great tools and conversion tool.
You can paid or used free like VISITOR or MEMBER - if you register your user will have 1 GB maximum file size.
The price can be from free up to: 1m Unlim PASS /$29.99
Any type of files like: archives, audios, documents, eBooks, images, presentations, videos can be converted.
You also can deal with tools for PDF like: unlock , OCR, compress ...
One simple example:
I converted 9.34 Mb .avi file to 14.51 Kb .swf file. and it's working well for free account - VISITOR.
For documents we have this formats:
This website don't convert 3D objects and meshes.