ICO converter is a free online, easy-to-use tool that helps you convert any image into .ico format. An ICO file mainly contains an icon. These are widely used to depict a Windows file, program, or folder. A .ico file can store one or more than one image in multiple sizes. Depending on their use, these are stored in such a fashion to scale them later. ICO files are very similar to the.CUR files (in Windows), and.ICNS files ( in macOS ). The tool is relatively user-friendly. You can upload PNG, JPEG, GIF, BMP and such image file formats in the input box, but the size must be less than 4MB. Also, a square aspect ratio is highly recommended. You can directly drag and drop the input file or upload it directly from the device. You can also choose multiple resolutions such as 16 pixels, 32 pixels, 48 pixels and so on, along with the bit depth. Now click on the "Convert" button to start the conversion process. Within seconds you will get your converted .ico file in the output box. Now you can download it to your device and use it later.