Question: what is the difference between letter size and a4?
Answer: The two are very similar in visually, though you'll notice that the US Letter is wider whereas A4 sheets are longer. US Letter paper has a width of 215.9 mm with a length of 279.4 mm. US Letter is defined by the ANSI and used throughout North & South America. ... A4 sheets have a width of 210 mm and a length of 297 mm.