Paper size

Many paper size standards conventions have existed at different times and in different countries. Today, the A and B series of ISO 216, which includes the popular A4 size, are the international standard used by almost every country. The only exceptions are United States and Canada, where the "Letter" is more prevalent. Paper sizes affect writing paper, stationery, cards, and some printed documents. The international standard for envelopes is the C series of ISO 269.

Paper size

Many paper size standards conventions have existed at different times and in different countries. Today, the A and B series of ISO 216, which includes the popular A4 size, are the international standard used by almost every country. The only exceptions are United States and Canada, where the "Letter" is more prevalent. Paper sizes affect writing paper, stationery, cards, and some printed documents. The international standard for envelopes is the C series of ISO 269.