When you print your slides, PowerPoint Online turns your presentation into a PDF file. PDF preserves the layout and formatting of the slides. With most PDF readers, you'll get one slide per page with no headers or footers. However, if you use Adobe Reader, you’ll have more flexibility with printing.
If you don't already have a PDF viewer, you can download one from the web. See a list of the supported PDF readers here.
It isn’t possible to print multiple slides per page in PowerPoint Online. If you have desktop PowerPoint, you can open and print your slides there.
On the File tab, > Print, > Print to PDF.
To begin converting your presentation to PDF, click Click here to view the PDF of your document.
In the Print box that appears, under Page Sizing & Handling, click Fit, and under Orientation, click Landscape. Set any other print layout options that you want.
Note: If you need help picking print options, click the Help link in the upper right corner of the Print box.
In the Print box, pick any other options you want and then click Print.
Tip: The PDF file opens in a new browser window. You can close it when you are finished printing.
To print handouts, see Print handouts using Adobe Reader.