OutlineFixer is a lightweight, portable, command-line tool that fixes fuzzy outlines that may appear around transparent images when they are resized.
This can happen because fully transparent pixels still have a color (usually black or white) and when the image is resized, that color can bleed into the visible area.
The fix is simply to replace the colors of fully transparent pixels with the colors of nearby non-transparent ones.
Simply drag transparent image(s) into the .exe file to use it. Images will be re-saved in their same location as filename_OutlineFix.png.
May require Visual C++ redistributable.