How to convert PNG to JPG on Mac. You can save PNG files as JPGs in a number of common Mac apps, but the easiest is to use Preview. 1. Start Finder and then locate the PNG file you want to convert. 2.

Replace "lockscreen.png" There's also a more complicated way to change just your Mac computer or MacBook screen wallpaper, but keep your desktop the same.

It’s easy to change the wallpaper on a Mac: just right-click the desktop and select Change Desktop Background, or open System Preferences and select the Desktop & Screen Saver option.

Declutter Your Mac Desktop. Nick Douglas. March 15, 2018 MacOS: Some people keep their computer desktop neat. ... I made one for every PNG with “Screen Shot” in the name.

There are a number of reasons why Mac users would want to ditch PNG as the default file format for screen captures. Not all users can view PNGs, especially users running older versions of Windows ...