Common sizes include A2, A6, A7, and square formats.

A2, A6, and A7 cards are designed to fit standard envelope sizes that match each format.

Folding creates space for interior messages while maintaining a compact mailing size.

Choose based on the amount of content, intended envelope size, and printing method.

Design at full size, account for folds, and export at high resolution.

Export at exact pixel dimensions and highest quality to maintain clarity.