First things first, let’s get your designs artwork-ready. All Greeting Cards have four printable sides, so your artwork should either be two separate pages divided down the middle (this is where the fold will be) or as four separate pages. These will make up the outer and inner sides of your card.
First, choose the finished size of Greeting Card you require. At Printed.com, we offer Greeting Card printing in five different sizes:
148mm x 148mm (Square) A5 (148mm x 210mm) A6 (105mm x 148mm) DL (99mm x 210mm) 5″ x 7″ (127mm x 178mm)
If you’re uploading your artwork as two-page spreads, it should be double the length. I.e if your card is 148mm x 148mm then the full width of this size when it’s open is 296mm (2 x 148mm).
If you choose single pages, make sure each one is the correct size, i.e all being 148mm so our team can stitch them together for you.
Read more at https://www.printed.com/blog/greeting-card-printing/