"The main window of Jpegcrop displays the application menu and toolbar and your selected image."

"The Transform menu allows you to perform different actions with your JPEG picture: rotate it, flip it or transpose it."

"The Zoom menu lets you select the preferred zoom level. You can also change the zoom from the application's toolbar."

"The Options menu allows you to customize the application's behavior according to your needs and preferences."

"In the Preferences window you can choose the entropy coding method, the marker copy option and the processing mode."