Why is ShortPixel's image optimization different?
From time to time we hear of other image optimization services stating that they can compress images more than ShortPixel. As the leading WordPress image optimization service, we focus on always achieving the smallest image size while keeping the quality above a certain threshold. That does not mean your files will not be compressed; in fact, ShortPixel also gets almost always the smallest file too!
Images can always be made smaller simply by just reducing the quality - you can do that with the simplest image editor - but we have designed and developed our algorithms (Lossless, Glossy and Lossy) to create the smallest image possible while keeping the quality at a certain level.
In fact, our algorithms try to compress each and every image in several different ways, and choose the one that gives the smallest size while maintaining a certain level of similarity to the original.