PDF to image: when a picture of the page is what you need
Where an image beats a PDF
Slides, social posts, chat apps, design mock-ups and many website builders accept pictures but not PDFs. Turning the page into an image is often the fastest way to get it in.
What 150 DPI means
DPI is dots per inch. At 150 a standard page becomes roughly 1240 by 1754 pixels, which is crisp on screens and fine for office printing. For a large print, start from the original design file instead.
PNG versus JPG
PNG stores every pixel exactly, so text and diagrams stay clean. JPG makes smaller files but can blur small letters. These pages come out as PNG, and you can shrink them to JPG afterwards if file size matters.
What you give up
Once a page is an image, the text cannot be selected, searched or copied and links no longer work. Keep the PDF if anyone needs to read it with a screen reader or search it.
Getting one page
To extract a single page, print the page range you want and save the result as a new PDF, then convert that file. It is quicker than converting a hundred pages to keep one.
Planning to email the images? Convert the PNGs to JPG afterwards to cut their size by a large margin.