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.... save ( "pres-out.pptx" , SaveFormat...removeUnusedLayoutSl ( pres ); pres . save ( "pres-out.pptx" , SaveFormat...