I only occasionally need to compress the JPEG files I scan, when I need to submit them using an online updating page, which usually have size limits, and this program has been doing what it promises just fine so far. It made all my jpegs into half their original size, without a noticeable change in the visual quality. The only difference of the free version is the limit on the number of jpegs you can convert a day, which does not really bother me since I compress at most 3-4 ones a day.