You can easily export a document with transparent background.
To export a document with transparent background:
Click the
toolbar button (Command-Shift-I) to open the Inspector.Switch to the
tab and remove all layers of the page by clicking the close button left to the layer title:Make sure the
and options on the panel are switched off:At this point the document background should not be visible any more:
Click the
toolbar button (Command-E) and choose . When Posterino asks you for a filename and format for the image to export, make sure to choose PNG or TIFF as format:JPG images can't have transparent backgrounds.