<p>Excellent question! When you upload a JPEG file, the image is analyzed. Textures, patterns and colours are <strong>automatically identified</strong>. The encoder creates an optimally compressed JPEG file based on that information. The final result is compared with the original and fine-tuned. Distracting JPEG artifacts are minimized <strong>without big sacrifices in file size</strong>. Unnecessary metadata is stripped as well. You will get an optimal image, every time!</p>