PhotoBulk is an easy-to-use batch photo editor. Watermark photos, Optimize and Rename photos at once.

PNGGauntlet is a PNG compression app for Windows.

PngOptimizer cleans PNG files of useless or wrong information, reduces your PNG files weight.

ImageOptim makes images load faster. Removes bloated metadata. Saves disk space & bandwidth by compressing images without losing quality.

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.