PowerPoint comes with a built-in background remover function using which the original background of the image can be removed and converted into a transparent one. Steps on how to remove picture background in PowerPoint:
Launch the PowerPoint presentation app on your system and then open the slide with the desired image.
Select the image and add it to the application in a new tab called "Picture Tools Format".
Next, get to Picture Tools Format and choose the Remove Background option. The PowerPoint app will color the image into the pick colors for the parts it assumes as the background.
You can further customize the area by selecting Mark Areas to Keep or Mark Areas to Remove. Next, you need to make a line around the picture area.
To apply the changes, select the Keep Changes option.