Preset: Standard
Image Optimizer Compressor
Up to 4x, max 3 MB each, uploads automatic deleted after 1 day.
For optimal PNG color-reducing, zoom in strongly and reduce the color palette gradually. Keep comparing with the original, until the match still fits. Activate dithering for images with color-gradients, example. For images with less unicolored areas, set min. 16 palette per area. For example a logo with 2 colors, try 32 palette.