How to: Export Class Diagrams As Images (Class Designer)
To export a class diagram that you created from code in a project, save the diagram as an image. If you want to export UML class diagrams instead, see Export Images of Diagrams.
Open your class diagram (.cd) file.
From the Class Diagram menu or the diagram surface shortcut menu, choose Export Diagram as Image.
Select a diagram.
Select the format that you want.
Choose Export to finish exporting.
To automatically update exported images that are linked from other documents, export the diagram again in Visual Studio.