You can create a PDF file from Microsoft PowerPoint. This results in the conversion of PowerPoint slides to PDF file.
1) Have your PowerPoint slides you're going to convert opened with Microsoft PowerPoint.
2) File->Print, choose PDF Creator printer as the default printer in Microsoft PowerPoint from the printer list.
3) As PDF Creator printer uses Microsoft PowerPoint printing options, by clicking the "Properties" button on the right of the side of the printer list, change the printing settings in Microsoft PowerPoint as you would have them appear in the PDF format. This includes the paper size, image compression, encryption, color space, etc. Change the settings to your preferences on the Print dialog box. Confirm the print job by clicking OK.
4) A creation dialog (Save-As dialog) will appear. You'll be given options about general document information for your PDF. Select and set these accordingly. Then save the file and specify the folder location in which you want it saved. You have to save it to create the PDF. The file will save with a .pdf file extension.
5) Once saved, if you didn't check the option to automatically have the PDF launched after creation, you may have to open the PDF again using a PDF viewer.