This app can execute the following operations to JPEG image without quality loss. - Cropping (with specified aspect ratio) - Flipping horizontal and vertical - Rotation 90,180 and 270 degrees - Color adjustment - Pixelation Generaly, editing JPEG make loss. But this app not. Tips in cropping mode. (difficult to find operations) -With fixed aspect ratio, only the corner of the cropping rectangle can be dragged. -Long tapping the inside of the rectangle, you can move the rectangle. This app based on Jpegtran source code.