Pre-Optimized PNGs are still huge in Unity.

So here is my question. I made a game for android using Unity. The total file size was 11.3MB. I have all my images in one folder, which just so happened to be around 11MB. All images are PNG images. I downloaded a program to ‘crush’ or optimize the PNGs (PngOptimizer-2.3-x64). Now, the total size of all of my PNGs is 3.09 MB. When I import these into Unity (by dragging into scene, or clicking import, or closing unity, placing the images in the folder, then opening Unity. They are all back to their original size. What can I do to keep these images smaller? Meaning, the size they are before I import to Unity.

Tweak the import options in Unity. If multiple ones have the same import settings, select them together and set them simultaneously.

Unity does not use PNG, or JPG, or any other non-GPU format. The only thing that matters are the import settings in Unity; that’s the format that’s actually used in a build.