Cesium, only a minimum of time to compress the image to your hard drive so it will reduce the quality of a simple program takes up much less space.
This program is easy to use. You just (photo at a time you can convert a large batch) window, drag the image or between 1 and 100 by sliding the quality tab, select the desired degree of compression, and lastly, there click on the "compressed."
The more you compress the photos, the less space they will take up on your hard drive, and low-quality. So it's a balance between high quality and in a short space of injury reduction, for example by 90% if you try to reduce the size of a file in, you probably will not like the effect on the image quality