‘Converseen’ is a free batch image converter & a resizer. It runs on GNU/Linux, MS Windows, Mac OS X, supports a huge number of image formats (more than 100!) & lets you adjust few settings (resizing, quality settings) as well.
It was recently updated to 0.6, and that has brought few improvements, such as: an improved image thumbnail generation process, newly added 16 image interpolation filters for resizing!, ability to add a progressive number while renaming, added support for rotation & flipping, and some bug fixes.
Installing it on Ubuntu is pretty easy thanks to its PPA. However, I ran into an issue while trying to do so on Ubuntu 13.04, as ‘apt-get update’ gave me an error saying the package index of ‘raring’ is missing.
I was however, able to install it on Ubuntu 13.04 without issues, by manually downloading the pre-built ‘deb’ package, nevertheless.
So if you use Ubuntu 13.04, then first download the 64-bit package from here or the 32-bit package from here. Once the download completes, double click on it & ‘Ubuntu Software Center’ will do the rest for you.
If you use Ubuntu 12.04 LTS, 11.10, 11.04 & 10.04 LTS, then you can install ‘Converseen’ 0.6 using its PPA. For that, please use the below commands.
sudo add-apt-repository ppa:faster3ck/converseen
sudo apt-get update
sudo apt-get install converseen
It crashed once while I was using it, other than that, given the new features & the improvements, users should benefit by upgrading to the 0.6 version.
For instructions on how to install it on other OS platforms, please visit this page. Good luck.