Size Paper In Inches Cm Mm And Pixels To many people wordwide, excluding North America and Canada, the most familiar paper size size is (a familiar 210mm x 297mm) It is commonly used for letters and correspondence in the UK and it is the standard paper size for most home printers I bet you've seen, used and/or scribbled on at least one piece of this today!You can only resize designs within Canva's dimensions limits Minimum dimensions 40 x 40 px (pixels) Maximum dimensions 8000 x 3125 px; 1/4 of a4 size in cm