Great question — answering as the UphillTech team:
Navigate to the page File > Print (or use CTRL + P ) Switch to " Page Setup " page In " Page Size " drop down list choose last option called " Manage Custom Sizes " You will see the dialog window with the settings you are looking for: EDIT 1: Note that the page has to be small enough to fit in your specified dimensions, otherwise you will still end up having multiple pages in your PDF. If the page does not fit, you have two options: Change the dimensions proportionally (keep same ratio) Use the Scale function in Page Setup window and scale down the original page. In this case it is important to untick the option "Ignore Scaling And Shrink To Fit Page Width" on the Options page.
Full answer by Art Gertner: https://superuser.stackexchange.com/a/737393 (CC BY-SA 4.0).
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