How to Screenshot the Mac Dock Jun 10, 2021, 9:00 am EDT | 1 min read Thanks to a little-known shortcut, you can easily capture a clean screenshot of your Mac’s Dock without wallpaper, including translucency in the PNG alpha channel, with no cropping necessary. Here’s how to do it. The Secret: a Simple Shortcut Whenever you want to capture a screenshot of your Dock (and only your Dock), press Shift+Command+4, and then press the Space bar on your keyboard. This puts the screenshot tool into window and menu capture mode. After you press Space, your mouse cursor will turn into a camera icon. Place the cursor over your Dock. When you see that the Dock is highlighted, click your primary mouse button.