2. Click Save As in the pop-up menu.
3. The Save As File window pops up, and click the "black inverted triangle" symbol behind the save type.
4. The selection window for saving file type pops up. There are many file types here. Click "pdf".
5. After clicking "pdf", you can see that the file saving type has changed to "pdf", and click "Save".
6. Then open the location where the pdf file is saved, and you can see that ppt has been successfully converted into pdf format.