You can upload your own design using 'Upload your design' templates that are visible in each category and then use the 'Add Image' button. The supported file formats include JPEG and PDF (one file per page). The actual size of the cards comes when you choose a size and format (under the "Upload your design" thumbnail). There is no vertical option for this, however, you can rotate your image and text to your liking.
Customization is completely free and does not cost extra. You can upload photos (as many as you like), enter your own text, and change the fonts, sizes, and colors of fonts in text boxes.
Note, however, that we are a self-service platform and cannot review the order until it is printed. View the preview on the box and place the order when satisfied.