SizeMyPics can export your images to following formats:
JPG, GIF, PNG (Without Alpha-Channel), TIF, BMP and PSD
Additionally several compression-types for JPG-files are available.Next to a selection of predefined values, an option to set an individual percental value is also available.

Following options to manipulate the image-dimension are available:

- shrink to fit defined dimensions by respecting aspect ratio
- enlarge to fit defined dimensions by respecting aspect ratio
- shrink or enlarge to fit defined dimensions by respecting aspect ratio
- shrink to exact defined dimensions ignoring any aspect ratio
- enlarge to exact defined dimensions ignoring any aspect ratio
- shrink or enlarge to exact defined dimensions ignoring any aspect ratio
- adjust to height respecting aspect ratio
- adjust to width respecting aspect ratio
- crop to fit the exact defined dimensions
- crop to height
- crop to width
- adjust height, crop width and pad with color if necessary
- adjust to width, crop height and pad with color if necessary
- proportional resizing to defined percent-values
- change DPI-resolution

Compatibility: OS X 10.10 or later
Homepage:

https://www.xelaton.com