Converter365.com is a universal online tool for the conversion of a multitude of different formats that is also completely free of charge. To find the format you need, you can search nine categories Image, Vector, Video, Audio, Documents, Archive, Spreadsheet, Presentation, and E-Book.
Anvil PDF Filling API - The easiest way to programmatically populate any PDF
File Converter - Convert & compress everything in 2 clicks!
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
Smallpdf - PDF document management and conversion suite
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
CR2toGPGconverter - If you need to open, edit or print the images from your Canon DSLR that are in CR2 format, you’ll have to convert them in JPG or some more accessible image format.