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Si vous voulez effacer vos output .Voici la méthode.
You can try do this with the following steps since it worked for me :
Select the "Cell" -> then Then select "All Outputs" -> There you will find "Clear" option -> select that.
And then save the file.
This will reduce the size of your file (From MBs to kbskBs). It will also reduce the time to load the notebook next time you open it in your browser.
As per my understanding this It will clear all the output created after execution of the code. Since Notebook is holding code+images+comments in addition to this its also holding the out put in that file therefore it will increase the size of the notebook.