The Export to Image option in the File menu allows you to save an image of the molecule in the sketcher.
Images exported in .jpeg, png and svg format can be re-opened in MarvinSketch if the source was exported in the image file.
In these format the Save source option which is enabled by default can be disabled on the Export window by ticking it off tin the corresponding pane.
Marvin supports the following image formats:
Saved images cannot be edited in Marvin