# Usage of Microsoft Word
# word a4 to b5 original ratio
The only 100% reliable way is to save the file in PDF format, then use Adobe Acrobat to print the PDF with the page scaling set to 'fit prinatble area' or 'fit to printer margins' (terminlogy varies by Adobe Acrobat version).
Although you could use a macro in Word to re-scale everything, fonts, for example, can only be re-scaled in 0.5pt increments, which may not be precise enough to get a perfect fit (going from A5 to A4 requires a 141.4% re-scaling).
In the Print dialog, under Zoom, choose the appropriate size from the "Scale to paper size" option.
This problem can be solved when print it.