It’s not ‘_convert_ a pdf _to_ a jpg’, it’s more like ‘_extract_ a jpg _from_ a pdf’. A pdf is a container for layout of text and graphics so t can be seen on most any device that has some kind of pdf-viewer or Page Numbering Online . If you’ll google on ‘how to extract images from a pdf’ you’ll find a dozen or more apps and websites that will extract the images from pdfs for you.
The advantage of using Adobe Acrobat on PDFs is its flexible PDFs, in an already developed system.