Niall's png2ico (formerly PNG 2 ICO File Converter)

Niall's png2ico is a program with a pretty self-explanatory name - it allows you to turn image files from the PNG format into the ICO extension.
This type of tool can help you create icons for files from your favorite images. It can be seamlessly handled, even by inexperienced users.
This is a portable piece of software, so installing Niall's png2ico is not necessary. It means that you can store the tool on a USB flash drive or any other external device, save it to any computer and directly run its executable file.
Therefore, you can always have Niall's png2ico with you when you're on the go. Plus, no new entries are added to the Windows Registry and no leftover files can be found after program removal.
The interface of the application is based on a standard window. Importing items can be done with the help of either the file browser or 'drag and drop' method.
It is possible to process multiple items in a single session (up to 9 images), but you cannot import them at the same time. So, all you have to do is establish the output directory and filename for each entry, and let Niall's png2ico take care of the conversion procedure, after you click the 'Create Icon' button.
The program puts little strain on the computer's resources, as is uses a low amount of CPU and system memory. We have not come across any issues during our evaluation; Niall's png2ico did not freeze, crash or pop up error dialogs. Despite the fact that the tool has limited features, Niall's png2ico manages to deliver output files with a good image quality.