n A4 envelope is a type of envelope that is specifically designed to fit A4-sized paper (which measures 210 x 297 mm or 8.27 x 11.69 inches). These envelopes are commonly used for sending standard documents such as letters, official papers, and forms.
The most typical A4 envelope size is:
C4 Envelope: 229 x 324 mm (9.02 x 12.76 inches), which can fit an A4 sheet of paper without folding.
C5 Envelope: 162 x 229 mm (6.38 x 9.02 inches), which can fit an A4 sheet folded in half.
DL Envelope: 110 x 220 mm (4.33 x 8.66 inches), which fits an A4 sheet folded into thirds.
