how to set a3 size in word
Just go to Layout | Page Setup | Size and choose A3 from the dropdown. Whenever possible, change the paper size before writing the document.
How do I convert A4 to A3 in Word?
How do I print from A4 to A3 and scale the content to fit on the A3 size? Assuming your printer can print A3, on the Print tab of the File backstage, click the arrow beside “1 page per sheet” and choose “Scale to paper size.” Select A3 as the desired size.