How to change Document Size in Microsoft Word

First, select Page Setup… from the File menu.

                  

 When the Page Setup dialog box appears, click on the Paper tab.

                 

Under the Paper size: section, click on the arrow in the drop down box that says Letter (may vary depending on installation language and country version). There are plenty of defined paper sizes and envelope sizes preconfigured for you, among which are Legal size, A4, and various envelopes; it helps if you know the name of the paper you are using. Make your selection by highlighting it. If your paper size is not in the list, select Custom (all the way at the bottom of the list).

              

Your dimensions will appear in the Width and Height selection boxes. If you selected Custom size, you must specify the dimensions by highlighting the entries in the boxes and typing the sizes in inches (the “ is not required) or by using the arrows to change the size using Word’s predetermined increments.

If you are applying the change to the entire document, click the OK button at the bottom of the dialog box.

If you want to apply the change from the cursor position forward only, click the arrow in the drop down box beneath Apply to in the Preview section, highlight This point forward and then click the OK button.

           

Also, you can apply it to a page or two in the middle of the document if you choose. Simply highlight the selection you want to change before you open the Page Setup dialog box. Follow the steps above. Before you click the OK button, click on the drop down box beneath Apply to in the Preview section. Selected text has replaced the This point forward option.

           

Highlight Selected text and then click the OK button.