Drag a slider to see what changed between two pictures.
Choose a Before and an After picture to compare them.
Choose the original.
Choose the edited version.
Move it across the picture, or use the arrow keys.
No. It is processed in your browser, so the picture stays on your device.
No. If their shapes differ, the second one is stretched to fit the first.
Checking a compressed or upscaled picture against the original, or showing an edit.
Yes. Focus the picture and use the arrow keys.