A4 is the most common paper size worldwide. A4 paper measures 8.27" x 11.69" and is longer and narrower than U.S. 8.5" x 11" letter size paper. This small difference can cause big printing and distribution issues with documents sent to and received from other countries. With our wide selection of A4 paper, you can eliminate paper size compatibility challenges. Stock A4 paper in your printer, copier and fax machines to prevent document cut-off and distribution problem.