The Windows Snipping Tool is the most direct way to capture a screen area and save it specifically in JPG format.
: To get a JPG, you may need to "Export" or "Save as" within an image editing app on the device. Method 3: Creating Professional Step-by-Step Guides
: In the "Save as type" dropdown, change the default from PNG to JPEG/JPG .
: Press the Power + Volume Down buttons simultaneously.