Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms.... Pdf417Columns : Number of columns ( 1 – 30 , or 0...0 for auto). Pdf417Rows : Number of rows ( 3 – 90 , or 0 for automatic)...