Image to ICO Converter

ICO is the Windows icon format, and its defining trick is that a single .ico file can hold the same image at several sizes at once, from a tiny 16 by 16 pixel favicon up to a crisp 256 by 256 app icon. The operating system or browser then picks whichever size it needs for a given spot. That is exactly what makes ICO the standard choice for website favicons, desktop shortcuts and Windows application icons.

Converting an image to ICO is the step that turns a logo or symbol into a real favicon. Start from a clean, square PNG with a transparent background, convert it to ICO, and you have the little icon that shows up in browser tabs, bookmarks and the address bar, the small detail that makes a site feel finished and trustworthy. The same file doubles as a Windows program or shortcut icon, so one conversion covers both jobs.

This ICO converter packs the right sizes into your icon automatically and runs entirely in the browser, with no signup and no watermark. Convert one image or several and download each result or the whole set as a ZIP. For the sharpest favicon, feed it a simple, high-contrast square design, since fine detail tends to disappear once an icon is scaled down to sixteen pixels across.