Portable Document Format or PDF is a open file format developed by Adobe. Unlike .DOC or .ODT, A PDF file displays the exact same layout and content no matter which device or software application it is viewed on. This convenient and compact document format also offers security though content signing and password protecting documents.
PNG (Portable Network Graphics) is a transparent lossless bitmap image format. It supports 24-bit RGB or 32-bit RGBA pallet base images, grayscale and other formats. Compared to JPEG, PNG images do not allow high compression.
PS2PDF PNG to PDF converter is the world's fastest free online image to PDF converter. The converter does not have any limits. All files are uploaded to Google Cloud so that you get the fastest upload and download speeds no matter where you are in the world.
PNG files format is an open file format that supported by all most all browsers. You can simply right click on the PNG image and open it on a browser. If you want to edit them, then you can use Windows 10 Photos application. Which lets you rotate, crop, add a filter to images.
You have numerous option when it comes to edit or view PNG images on Linux/Debian platforms. A couple of my favorite programs are GIMP and Krita. If you want to learn more, there is a great how-to article written by Nick Congleton on best image editing software for Linux.
You can install GIMP to view or edit PNG files on Mac Computers.