If you do not see the Save As option, hold down the “Option” key on your keyboard and you should be able to see it.Ĥ. When the image launches in Preview, click on the “File” menu and select “Save As…” to save the image in PNG format. To convert to PNG, right-click on the image and select “Open With” followed by “Preview” to launch the image in Preview.ģ. If it is in another format, you need to first convert it to PNG. Your image must be in PNG format or it will not work. If it is of low-quality, it will look blurred, and you are definitely not going to like that.Ģ. First, get a high-quality image that you wish to set as the login screen wallpaper. Getting the Login Screen Wallpaper Readyġ.

What if you could change that wallpaper so that you see something that you like when you start your Mac instead of the old-fashioned (but still good) default wallpaper? There is, and doing so does not require you to buy or install a third-party app as the entire job of changing wallpaper can be done from the built-in apps on your Mac.

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