Delete: “Delete”
MAC OS X
Return: “Crop”
Shift+Command+Z: “Redo”
Command+Z: “Undo”
Command+C: “Copy”
Command+V: “Paste”
Command+X: “Cut”
Command+A: “Select All”
Command+S: “Save”
Windows / Chrome OS
Enter: “Crop”
Control+Z: “Undo”
Control+Y: “Redo”
Control+C: “Copy”
Control+V: “Paste”
Control+X: “Cut”
Control+A: “Select All”
Control+S: “Save“