An image converter is a file converter that converts one image file format (such as JPG, BMP, or TIF) into another. If you can’t use a photo, picture, or other type of image the way you want because the format isn’t supported where you want to use it, this type of software can help.

Below is a list of the best, completely free image converter software programs that I have used. My favorites are online services because I can use them to convert images through my browser without having to download the program, but I have also mentioned desktop apps because they have their own advantages.

I recently came across Image Candy and just had to add it. It is a website with many free online tools, including an image converter. It supports a huge number of input formats and will convert images as large as 2GB.

Besides the ability to convert huge files, I recommend this converter because it is so easy to use. Just upload one or more photos to the site, rotate them if necessary, and then choose from one of the supported output formats. You can download each converted file separately or together in an archive.