Nikon D3300 - Manual (Page 212)

192 Playback and Deletion
Unprotected photographs can be deleted as described below.
Once deleted, photographs can not be recovered.
Full-Frame, Thumbnail, and Calendar Playback
1
Select an image.
Display the image or highlight it in the thumbnail list in
thumbnail or calendar playback.
2
Press the O button.
A confirmation dialog will be
displayed.
3
Press the O button again.
To delete the photograph, press the O
button again. To exit without deleting
the photograph, press the
K button.
Deleting Photographs
Full-frame playback Thumbnail playback
O button