How to choose a good resolution for sprite?

I don't know how sprite resolution works.

what can I do to maximize the quality of graphics without lost performance ?

what is the best resolution to use?

for exemple, I want a good quality of graphic even if I zoom on sprite.

Choose an image that is 1.3-1.5 times the size of what it will be in the game.

Any more than 2x and it will start to pixelize when shrinked.

okay but when I put on the project construct 2 and I reduce the size, why it will be pixelized? I understand If i grow up the image from a little size that will be pixelized, but reducing is that really make the sprite pixelized?

okay but when I put on the project construct 2 and I reduce the size, why it will be pixelized? I understand If i grow up the image from a little size that will be pixelized, but reducing is that really make the sprite pixelized?

No what you do is import the image to construct 2 and not resize it in the editor but resize the sprite that it produces.

Import the image and leave it alone.