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.... Join ( "testdata" , "qr.png" )) file , err := os . Open...filepath . Join ( "testdata" , "qr.png" )) file , err := os . Open...