Tinuous

inuous is an application to convert big lots of images to loads of different formats, saving time and effort instead of converting them one by one. To use it you just have to select the images you want to convert, choose the folder where you want to save them, and that's it. It can convert files between a lot of different formats, including the most popular ones such as PNG, BMP, GIF, TIFF, and JPEG. It doesn't matter which format you choose as the input and output formats, since Tinous can convert from any of them to any other, without losing any quality at all.