Png2ico

Png2ico is a straightforward command-line tool that enables you to turn images with the PNG format into icon files (ICO format). It is very simple to work with, even if your experience with software programs is limited.
Although graphical interfaces are more popular for carrying out an image conversion task, a Command Prompt dialog does not complicated itself with unnecessary visual elements. It usually requires just a few lines to perform a job, is light on the system resources and does not add new entries to the Windows registry, Start menu or other areas of the hard drive.
It is possible to create icon files with multiple resolutions, and all you have to do is point out the source and output file; these items must be placed in the same directory as Png2ico, and the target folder cannot be altered. Unfortunately, the tool does not come equipped with any other options.
As we had expected, the program runs on a very low quantity of CPU and RAM, so it doesn't slow down the overall performance of the computer. It has a good response time and works well, without making Windows hang, crash or pop up error dialogs. On the downside, Png2ico has not been updated for a very long time, so you might experience some issues when running it on newer OS platforms.