Nautilus image converter is a nautilus  extension to mass resize or rotate images. if installed  an additional menu entry will appear when you  right  click the mouse inside nautilus. It is a convenient utility which can save you lot of effort.
For installation on ubuntu. do the following.

1.) Open a Terminal

2) Type the command

$ sudo apt-get install nautilus-image-converter

3) Logout from the current session and login again.


You can rotate or resize the image as seen in the screen shots below.

Resizie

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