Best Free Image Converter (png to gif)
If you do any web programming you will eventually need to do some
image conversions. This is especially true if you download icon
libraries that are in PNG and need to convert them to transparent GIFs.
My favorite and free program for this is ImageMagick. You will find
the command line tool especially useful for doing batch conversions.
http://www.imagemagick.org/script/index.php
Note: If you can use PNG stick with it as you will lose opacity
layers if you convert these to GIF. Unfortunately some older browsers
don't support PNG so I typically use GIF for compatibility reasons.