A6 size: A6 is the smallest ISO standard

A6 is the smallest ISO standard paper size with dimensions of 105 x 148 mm. It is well-suited for postcards, greeting cards, and short letters, and can fit within an A4 document. A6 Paper Size, Dimensions and Format from the A Series which can be found in mm, cm, m, inches, picas, pixels and points. An A6 page measures 105 × 148 mm – this corresponds to half an A5 page and exactly a quarter of an A4 sheet. Due to its handy size, A6 is often used for postcards, flyers, invitation cards, notepads, or small brochures. The ISO 216 A-series international standard paper sizes are defined by halving area from A0 down. Folding parallel to shorter sides scales efficiently. Learn about how the A-series allows consistent sizing perfect for brochures, printing, and more.