A6 paper is a standard paper size that measures 105 mm by 148 mm, or approximately 4.1 inches by 5.8 inches. It is part of the A series of paper sizes defined by the ISO 216 standard, which is widely used around the world. A6 is often used for postcards, small flyers, and invitations due to its compact size. This paper size is half the size of A5 paper and a quarter the size of A4 paper. A6 is popular for personal notes and stationery, making it a versatile choice for both personal and professional use. Its small dimensions make it easy to carry and store.