1. When you open Word, click at the tabs (at the top)Â at 'Page Lay-out'.
2. In the tab 'Page Setup' you select the option 'Size'.Â
3. If 'Size' is clicked, on the bottom of the list you choose 'More paper sizes'.Â
4. A pop-up window with 'Page setup'Â will appear, in which you can change the document dimensions.
5. When you have changed the dimensions, you click 'OK'. Now you can convert your Word file to a PDF. Read how you can do this here.