Center images with original measurements

Hi, i want to solve this problem: When I upload an image and I choose upload in the original size and I choose ‘align to center’ option. When I upload the page this image appears aligned on the left (with the correct measurements).

I have tried some things and the only way that works is when I change the proportions, then appears correct, aligned to the center, but with less resolution. This also happens with GIF’s

How can i solve this? Thanks