ImageMagick: a simple, scriptable tool to convert, edit and compose Images:
There lots of software for customizing image files, but most of them are not simple and user-friendly. So if you’re looking for a simple and free customizing tool for images, check this one out. ImageMagick is a can convert, edit, and even help you create image files, and supports tons of image formats including jpeg, gif, png, tiff, and many more.
You can use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves and a lot more besides.