4 mm Height 5 inches 3. Global Perspectives on Sizing.
Universal Standard Postcard Measurements and Dimensions
18 mm to 0. 5 inches (89 mm) but no more than 6 inches (152.
This creates a portrait orientation that is instantly recognizable in any mailbox. The Universal Standard Dimensions To answer the question of what a normal size of a postcard is, one must look to the standards set by the Universal Postal Union (UPU) and national postal services like the United States Postal Service (USPS).
Universal Standard Postcard Measurements and Dimensions
A normal postcard is designed to be compact, making it easy to handle and sort by automated machinery while still providing ample space for a message and a photograph. A "postcard size" often used in photography or printing is slightly larger, typically 4 inches by 6 inches, which does not meet postal regulations for a standard stamp but is perfect for personal or promotional use.
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