What is an A4 envelope?

The A4 envelope is a special-sized mailing envelope designed specifically for 4 by 6 photos. The dimensions of the envelope are 4-1/4" by 6-1/4". Its square flap creates a secure seal to keep pictures safely inside throughout the mailing process.

A4 envelopes are only manufactured by Action Envelope. They are made from 24-lb paper, an inexpensive grade with a rich appearance. Although the original design was made for mailing photos, A4 envelopes are versatile enough for everyday business use as well as social and invitational applications. Their sleek dimensions also allow them to fit neatly inside a variety of larger envelopes.