Sprite looks crisp in editor but pixelated in Play mode and in build

This thread’s title is enough to explain my issue. I’ve searched through different threads with same problem that Unity users facing, but none of the solutions solved mine.
I don’t know whether its because of the Sprite packing, Asset bundling or something to do with the Build Settings.
Please help! 4459408--409276--example.jpg

4380889--397663--lowreso.PNG

try unchecking this box.