What are the size and shape restrictions for mailing custom die-cut postcards?

The U.S. Postal Service sets both size limits and shape requirements for mail, and custom die-cut postcards face stricter scrutiny than standard rectangular ones. The safest approach is to verify your exact piece before you print.

• Rectangular expectation: standard postcard rates apply to rectangular cards within set minimum and maximum dimensions.
• Aspect and thickness: very long, very square, or unusually thick cards can be surcharged or rejected.
• Custom shapes: non-rectangular die cuts often do not qualify for standard postcard postage.

Bring your proposed size and shape design to your local post office and confirm it meets current standards before placing a full order.