Make sure that the files are not compressed with Adobe Acrobat Pro 6.0 or newer, and that you have at least the size configured correctly in the PDF file settings as well. If you get that message after you've opened PPT's settings, go to File > Options, click on the PDF tab, check the box next to “Save all image files as PDF,” then click Save. Make sure that PPT will be in the default format when you import the file in PowerPoint. For best results, ensure that all the images in the file are the correct size and density. Microsoft has recently announced that the next-generation of their PPT feature will be completely PDF-enabled, but the way this feature will actually be implemented (i.e. how a person will actually be able to open PDF files and do the conversion) is still unclear. This is due to the fact that the feature appears to be a part of Microsoft's new Office 2019, but a few questions are being raised concerning how it will actually be implemented. So, how exactly will Microsoft bring their next-generation PPT format to the desktop? Well, it turns out that the Microsoft Blog did reveal how they envision the process: As mentioned above we are working on a new generation of PPT and this is an important first step. We know that it will require much work with Windows Server 2019, but we are confident that we will be able to deliver the best solution. The next step will be to support both types of PDF (i.e. Microsoft PPT and Open Document Format), and we are working with the leading Open Document Format certification team to make sure these solutions are up-to-date as part of Windows Server 2019. If you wish to learn more about Microsoft's new PPT feature, you can check out the full blog post here. It's Not Always As Easy as It Seems… If you have a few years of PPT experience under your belt, and you've already mastered all the steps, you may be wondering what I mean with the word “easier.” Here are the four possible scenarios I see for the process of converting a large PDF to your native word-processing format. Scenario 1: You Have a Very Large PDF File A large PPT file that is not formatted correctly might have issues with the export of the file. To convert this file, one would have to use something like a word processor and format it using a PDF converter.