Extensions Plugin Manager Edit Media Action Group
From Joomla! Documentation
Media Action Group[edit]
This group of plugins allow image crop, resize and rotate functions. In the media manager hover over a thumbnail, select the menu symbol (...) and then the edit symbol (pencil). That opens the image edit screen:
Media Action - Crop[edit]
Adds crop functionality for images. This plugin has no options.
Media Action - Resize[edit]
Resize functionality for images. This plugin has no options.
Media Action - Rotate[edit]
Adds rotate functionality for images. This plugin has no options.