Can I use a square postcard for EDDM?

Yes, you can use a square postcard for EDDM as long as it meets the minimum dimension requirement, meaning it is taller than 6.125 inches or longer than 10.5 inches on the relevant side. A 7" x 7" square, for example, would qualify.

• Meets the minimum: a 7" x 7" square clears the 6.125-inch threshold.
• Watch the cost: unusual shapes can cost more to print than standard rectangles.
• Watch processing: squares and odd shapes can sometimes cause hiccups in automated mail handling.

A square format stands out in a stack of rectangular mail, so if the added print cost fits your budget it can be a memorable choice for an EDDM route.