A common printer paper size used for regular documents is called Letter, which is 8.5″ by 11″. It is quite popular for printing office documents, forms, school assignments and letters. A4 (210 × 297 mm) is also a popular size, used internationally. Verify your document size with your printer settings prior to printing to ensure the selected size is correct, and that the correct paper is in the printer. Note: By selecting the proper setting, you can avoid problems like cropping, placement of text in the wrong location, or unwanted blank space on the printout.