As the name implies, PDF Online provides a simple tool that converts your files to PDF. It's a one page converter website with an upload button that immediately lets you select the file you would like to convert. The converter allows multiple file formats to be converted to PDF but only converts PDF to Word. According to the comments on their website it’s a very good and fast converter. In addition to the PDF conversions, it's also possible to merge or split the pages of your uploaded PDF. A very complete, but simple PDF utility site.