Select paper size
- On the File menu, click Page Setup, and then click the Paper tab.
- Click a paper size.
Note To change the paper size for part of a document, select the pages and then change the paper size as usual. In the Apply to box, click Selected text. Microsoft Word automatically inserts section breaks before and after the pages with the new paper size. If your document is already divided into sections, you can click in a section or select multiple sections, and then change the paper size.