A5 is a standard paper size measuring 5.83 inches by 8.27 inches (148 x 210 mm), commonly used for smaller prints, booklets, invitations, and promotional materials. In photography, A5 is ideal for printing compact photo portfolios, mini-albums, postcards, and proofs, offering a convenient size that is easy to handle, mail, or display. Its smaller format allows photographers and designers to produce professional-looking prints without using larger, more costly paper sizes, making A5 a popular choice for personal and commercial projects.