This win32 application will convert images into any standard image format (bmp,jpg,tiff,png,gif,pcx etc). It will also resize images to specified size, will convert images to its grayscale and negative. All this can be done in single or batch mode
Description says "This win32 application will convert images *INTO* any standard image format (bmp,jpg,tiff,png,gif,pcx etc)." (emphasis added) so the implication may be that it handles those formats. However, when you run the program, it only takes JPEG files as input. I needed a batch converter from type x to type y graphics where x and y are a reasonable assortment of common graphic file formats. No such luck here.