jupyter_contrib_nbextensions/nbextensions/usability/hide_input_all

This extension allows hiding all codecells of a notebook. This can be achieved by clicking on the button toolbar:

Typically, all codecells are shown with their corresponding output:

Clicking on the "Toggle codecell display" toolbar button hides all codecells:

Internals

The codecell hiding state is stored in the metadata IPython.notebook.metadata.hide_input. If it is set to true, all codecells will be hidden on reload.