iConvert is simple to use online tool that lets you convert images to Icon files ( ico, icns, and png ).

The application supports variety of image formats: .icns, .ico, .png, .jpg, .tif, .bmp, .svg, .tga and  .cur. 

To convert images, simply...

• upload your image and
• click on “Convert” button.

iConvert will convert your  images and  give you download links.

Try it out at http://www.eisbox.net/dev/iconvert/.

P.S. Ideal tool for Design Learners who wish to preview designs at smaller sizes.