You can easily export a document with transparent background.
To export a document with transparent background:
Remove all layers from the background by choosingfrom the " "-menu on the right of the title bar of each layer panel:
Please note that there are some layers which can't be removed. Like the, or layer.
Locate thepanel and make sure the and options are switched off:
At this point the document background should not be visible any more:
Click thetoolbar button (Command-E) and choose . When Posterino asks you for a filename and format, make sure to choose PNG or TIFF as format (JPG images can't have transparent backgrounds):