REST APIs and Free APps for documents & images conversion on .NET device. Convert between PDF, Microsoft Word, Excel, Visio Stencil File, Portable Network Graphic, PPTX, Project, HTML, email and images using our Free APps....allows you to convert between Visio Stencil File (VSS) & Portable...VSS to VSTM VSS to PPT VSS to PPS VSS to PPTX VSS to PPSX VSS to...