In Gliffy, you have access to export and print options through the File menu in the Menu Bar. In this menu, you can Export Gliffy documents in SVG*, JPG*, PNG*, and Gliffy (.gliffy) format and save them for off-line access.
To export your diagram, go to File->Export.
If you select PNG or JPG you will have the option to set the resolution up to 400%.
The SVG and Gliffy file options have one standard.