You can resize your design to different sizes in one go. Click ‘resize’ in the top bar on PosterMyWall editor. Select the sizes you’d like to resize your design to. Click ‘copy & resize’.
Copies of your resized design will open in new tabs, which can be customized and saved to your My Stuff. You may have to adjust design elements after resizing a design. The original design will remain unchanged.
Want to watch a video tutorial instead? Here's a 20 second video to get your acquainted with copying and resizing.