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.
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.
If you have an earlier version of Windows or if this method does not work, use a stand-alone compressor. Nippy Zip processes files online, avoiding the need to download a program, take up space or risk viruses. 7-Zip is a free open source program, allowing technically savvy users to modify the program to meet their needs. Finally, the commercial WinZip can secure compressed archives with passwords and automatic shredding after use.