The default paper size in Word is 8.5 x 11 inches which easily fits in most of the printers.But this size is not fixed as you can change it if you want a document with a different paper size. The steps to change the paper sizes are:
- First, Click the Page Layout tab
- Then, In the Page Setup group click the Size command
- Paper size menu will now appear
- With a left mouse click select your desired paper size
- To customize the page size click on the ‘More Paper Sizes’ option
See image below: