Creator provides easy conversion between graphics file formats.

Features :

    Can read the following image formats : AIM, BMP, CadSoft, Clear, Degas, Draw, GIF, IFF, ImageIO, IMG, Irlam, JPEG, MacPaint, MTV, PBMPlus, PCX, Pineapple, PNG, QRT, Sprite, and TIFF.
    Can write the following image formats :BMP, Clear, GIF, ImageIO, JPEG, PBMPlus, PNG, Sprite and TIFF. Colour reduction (if needed) is performed using high quality Heckbert quantization and Floyd-Steinberg dithering algorithms. 

Note that Creator offers only a subset of the functionality offered by Translator, but is easier to use if only format conversion is required.

Creator is part of the Shareware combo consisting of Translator and Creator, which costs 15 Euro. As long as you're not registered, it will regularly 'nag' at you, but is otherwise fully functional.