Smallpdf - PDF document management and conversion suite
Wide Angle PDF Converter - Convert PDF documents to Word, PowerPoint, Excel, JPG and other formats!
iLovePDF - Free online PDF tool set
Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
CometDocs - Free online conversion service. Possible to determine unknown file format too.