Choose the format of the paper you wish to fold or mail:
Select how you plan to fold the paper sheet inside the envelope:
Your A4 sheet (210 × 297 mm) folded as flat (unfolded) results in a dimensions payload of 210 × 297 mm.
Dotted outline represents the C4 envelope; solid block is the folded A4 paper.
The smallest, most cost-effective envelope style that comfortably fits this folded document shape.