How to set the slide size? IMPORTANT Follow these steps only before you add content to your slide. Therefore, you have to set the slide size to the desired size of your poster. As mentioned previously, the page size of 7.5' x 10' cannot be printed into a good quality poster. The default slide size of a new PowerPoint presentation is 7.5' x 10'. When you create a poster in PowerPoint, you are essentially creating one big 'slide' that is your poster. Since the page size problem of a PDF file is most likely caused by the incorrect slide size set in a PowerPoint file, which is later used to generate the PDF file, in this post we want to talk about the slide size setting of a PowerPoint file. Enlarging a 7.5' x 12' page into a 36' x 56' poster likely would generate a poster that does not have enough resolution for quality viewing. For example, a customer wanted to print a 36' x 56' poster, but the PDF file that he sent to us only had a page size of 7.5' x 12'. One of the most common issues that we have encountered when printing posters for our customers is the incorrect page size specified in their PDF files.
