Converting VGA to HDMI is an excellent way to watch your selected online shows and videos on your home theater system, but for this task you need a VGA to HDMI converter. A VGA to HDMI converter is a device that changes one form of signal to another. Some people think that a VGA to HDMI cable is sufficient to get the job done which is impossible. An analog signal cannot be changed to digital without a converter. They are fundamentally different signals, not just incompatible connections.