Software & Apps MS Office Changing the Paper Size in Word You aren't tied to letter-size paper and documents in Word By James Marshall Writer James Marshall is a pro journalist who covers technology and computer troubleshooting. He is also skilled with Microsoft Word, Apple Pages, and other word processors. our editorial process James Marshall Updated March 27, 2020 MS Office Word Excel Powerpoint Outlook Tweet Share Email For U.S. versions of Microsoft Word, the default paper size is 8.5 inches by 11 inches. While you probably print most of your letters, reports, and other documents on this size paper, changing the page size in Word to use a different-size paper is a straighforward task. Lifewire / Michela Buttignol Word does not place many limitations on page size or orientation. There is a good chance that your printer sets greater limitations on the paper you use than Word does, so before you make any changes to the page size, you should consult your printer documentation. It may save you a lot of frustration in the long run. How to Change a Document Paper Size for Printing You can change a document paper size for a new file or for an existing one. Open a new or existing file in Microsoft Word. On a Mac, choose the File menu and select Page Setup. In Word 365, choose File. Select Print in the left-hand pane, then the Page Setup link at the bottom of Settings. On a Mac, when the Page Setup dialog box appears, it should be set on Page Attributes. If not, click the drop-down selector at the top of the box and select Page Attributes. For Word 365, you may need to click the Paper tab at the top of the dialog. Using the drop-down menu next to (or under) Paper Size, select the size paper you want from the available options. When you make a selection, the Word document on-screen changes to that size. For example, if you pick US Legal on the menu, the document size changes to 8.5 by 14. How to Set Up a Customized Paper Size If you don't see the size you want in the drop-down menu, set up any specific size you want. On Mac and non-Office 365 versions of Word, click Manage Custom Sizes at the bottom of the list of paper size options. Click the plus sign to add a new customized size. The fields populate with the default measurements, which you will change. Highlight untitled in the customized size list and change the name to something you'll remember or recognize by typing over it. Click in the field next to Width and enter a new width. Do the same in the field next to Height. Set a Non-Printable Area by choosing User Defined and filling in the margin amounts in the Top, Bottom, Left, and Right fields. You can also select your printer to use its default non-printing areas. Click OK to return to the Page Setup screen. Select Other or the name you gave the customized size in the drop-down paper size menu. Your document changes to that size on the screen. Word 365 is a bit different. Set the Paper size to custom, and then set the various parameters in the Paper, Margins, and Layout tabs. Then Click OK. If you enter a paper size that the chosen printer cannot run, the name of the customized paper size is grayed out in the paper size drop-down menu.