When you take a screen shot by pressing your keyboard's "Print Screen" key, you capture an image that may contain more visual information than you need. Perhaps you only want to show a friend a headline from a news page or an error message from an application. If you use a commercial screen-capture program to snap a screen shot, you can use the program's crop tool to extract the section of the image that you need. There's no need for a commercial tool, though; you can use Microsoft Paint, included with all versions of Windows, to crop your screen shots.
Press "Print Screen" to capture a screen shot.
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Click the Windows "Start" menu to open it. Type "Paint."
Locate "Paint" in the list of search results and click it to open Microsoft Paint.
Press "Ctrl-V" to paste the captured image into the work area.
Click the "Select" tool at the top of the toolbar to activate that tool.
Click and hold your left mouse button while you draw a rectangle around the area of the image that you want to keep.
Click the "Image" button at the top of the screen and select "Crop" from the drop-down menu.
Click "File" and select "Save." The "Save As" window will open and prompt you to save the file. Type a name in the text box provided.
Click the drop-down arrow in the "Save as type" box to view a list of file types. In the list you will see JPEG, GIF, PNG and other supported image file types.
Select a file type and click "Save" to save the cropped screen shot.
Hover your mouse over the tool buttons in the toolbar to view the names of the various tools.