Open Microsoft PowerPoint
Click File
Click Open
Select the PDF file
If prompted, allow PowerPoint to convert the PDF
Review the imported slides
Save the file as a PowerPoint presentation
Click File
Click Save As
Choose the .pptx format
Select a save location
Click Save
If the PDF does not convert properly, use a PDF-to-PPT converter tool
Upload the PDF to the converter
Download the converted PowerPoint file
Open the converted file in PowerPoint
Save it again as .pptx if needed