Different aims need different format of the image.Here, www.coolutils.com, provide you free Image Converter. All kinds of images can be converted into many other formats you want.

Format is not the same mainly because of compression in different ways. Image compression can cause pixel lost. Such as JPG format, although high compression rate of small space but pixel image clearer lost. So many images use JPG format. Tiff format images is very clear, but occupies a space bigger, because contains more pixels, can be compressed into other formats of raw materials.

But if you just simply putting extension changed, then still USES the original compressed format will appear can’t open the image.
Use free image converter can solve problems above. Enjoy your time in image convertion.