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Everything on this page runs in your browser. Neither file is uploaded, and the page makes no request of any kind carrying your data.
Drop one on each side, or open them. The usual pair is the study that works and the one that does not.
Pixel data and other bulk elements are compared by length, not by content. Two files whose pixel data is the same size read as the same here - this is a header comparison, and turning a study's pixels into text to compare them would cost more than the page.
The differences as plain text. Values are left out unless you ask for them, because what belongs in a ticket is the difference rather than the study.