With Converseen you can save your time because it allows you to process more than one image with one mouse click!
Converseen is very simple: it features a very simple user interface without strange options.
With converseen you can:
Carry out a single or a multiple conversion.
Resize one or multiple images.
Compress images for your web pages.
Install Converseen on ubuntu
Open the terminal and run the following commands
sudo add-apt-repository ppa:faster3ck/converseen
sudo apt-get update
sudo apt-get install converseen