How do I take a screenshot of my computer screen? (Mac)

 How to take a screenshot of the entire desktop

  • Press Command-Shift-3 to save the screenshot as a PNG file on your desktop.

 
How to take a screenshot of a portion of the desktop

  1. Press Command-Shift-4. A cross-hair cursor will appear.
  2. Click and drag the cursor to select the area you wish to capture.
  3. When you release the mouse button, the screenshot will be automatically saved as a PNG file on your desktop. (The file is saved as PDF in Mac OS 10.3 and earlier.)

 
How to take a screenshot of a window

  1. Press Command-Shift-4 and then press the Spacebar. The cursor will change to a camera that you can move around the screen.
  2. Move the camera over a window to highlight it. 
  3. Click the mouse button and the screenshot will be saved as a PNG file on your desktop. (The file is saved as PDF in Mac OS 10.3 and earlier.)