Select PNG as the format, and click Saveĩ.
If your image isn’t in PNG, you’ll need to save a new version. Click File from the top panel and select Saveħ.
Change the resolution of your photo to match your Mac’s screen size, then click OKĦ. Click Tools from the top panel and select Adjust Sizeĥ. Open the picture you want to resize using the Preview appĤ. Open the Display tab and take note of your Mac’s screen resolutionģ. Click the Apple logo in the top left corner of your screen and select About This MacĢ. Here’s how to prepare your login screen wallpaper with Preview:ġ. You can do that with most photo editing software, but the macOS Preview app will do it just fine. How to prepare your Mac login imageīefore you can change your Mac’s login background, you need to make sure it’s the right format and size. You get one completely free try of each of its many tools. Try out today to see how it can help you. Plus it has many other features, including real-time antivirus, a VPN client and more. MacKeeper will find not only exact copies, but also images that are similar.