UPU has ambiguity regarding the thickness of postcards hence it many times causes a lot of problems in handling and other transportation. The UPU also states that a Postcard should have a minimum aspect ratio of √2:1 but can always have a higher aspect ratio making sure it stays well within the minimum and maximum dimensions mentioned. Generally, Postcards are made in A6 Size following the ISO 216 Rules for A Series Paper which has the dimensions of 148 mm × 105 mm (5.8 in × 4.1 in). The material of the postcard should also be thick enough to not undergo wear tear during handling and processing but shouldn’t be very thick to increase the weight. It has defined that postcards should have maximum dimensions of 235 mm × 120 mm (9.25 in × 4.72 in) and minimum dimensions of 140 mm × 90 mm (5.51 in × 3.54 in). UPU ( Universal Postal Union) is the organization that decides the International Standard Postcard Size. ![]() International Standard Postcard Size/Postcard Dimensions
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