Letter Paper Size Vs A4. All drawing sheets in an application must be the same size. A4 is a little taller, while letter is a little wider.
Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. No official size but a series prevalent. The two are very similar in visually, though you'll notice that the us letter is wider whereas a4 sheets are longer.
Compare us letter vs b5 paper vs a4 sheet visually.
It is used across the world except in north america and parts of central and south america, where north american paper sizes such as letter and legal. A4 paper size vs letter the difference is minimal, but important: A series both official and dominant. A4 is an internationally recognized paper size that measures 8.27 inches wide and 11.69 inches tall.