imgZilla

Instead of exposing sliders, it applies a fixed set of compression parameters tuned for output that looks identical to the source, so you drop files in and get results without trial and error. The compression engine runs locally, stripping redundant data and optimizing encoding without altering pixels, and a built-in side-by-side view lets you check quality before delivery. You can also remove EXIF and GPS metadata in one click before sharing photos. Free use has a daily quota, while a one-time purchase unlocks unlimited compression along with comparison and metadata tools.