JPGs are a popular way to store images on a hard disk or a Web page, because of their ability to maintain image quality while compressing size. Many programs--such as Windows Paint and Adobe Photoshop--can process such files. JPG files can sometimes become too large for convenient handling due to their size and quality. Windows XP or later operating systems include a built-in utility for compressing these files.
Open your file browser of choice, which varies among systems. In Windows XP, click "Start" and choose "My Computer" to display the My Computer window.
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Navigate to the JPG file that you need by double-clicking drives and folders to open them.
Right-click on the JPG and choose "Send To" and "Compressed (Zipped) Format." The file shrinks to a smaller archive in the same location as the original.