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....presentation to disk $pres -> save ( "Legend_out.pptx" , SaveFormat...setMaxValue ( 10 ); $pres -> save ( "output.pptx" , SaveFormat...