Convert Windows ICO icon files to macOS ICNS format. Perfect for cross-platform development, migrating icons from Windows to Mac, or creating universal app icons.
Building apps for both Windows and Mac? Convert your Windows ICO icons to ICNS for a native Mac experience.
Moving from Windows to Mac? Bring your favorite icons with you by converting them to the native Mac format.
ICO files contain multiple sizes. We extract the best quality version to create crisp ICNS icons for all Mac displays.
Use your Windows favicon or app icon as a custom folder icon in Finder or for personal Mac applications.
Standard ICO files contain sizes like 16×16, 24×24, 32×32, 48×48, 64×64, 128×128, and 256×256. Our converter detects all available sizes and uses the largest one for the best quality conversion to ICNS.
If your ICO file contains a 256×256 image or larger, we can create crisp ICNS icons up to that size without quality loss. For sizes larger than your source, we use advanced scaling algorithms (Lanczos) to maintain quality.
Both ICO and ICNS formats support full alpha channel transparency. Your transparent backgrounds will be preserved during conversion unless you specifically apply a background color or rounded corners effect.
Open the ICNS file in Preview, press Cmd+A to select all, then Cmd+C to copy. Right-click any folder or app, choose "Get Info", click the icon at top left, and press Cmd+V to paste your custom icon.
Yes! Favicons are typically ICO files. However, favicons are usually small (16×16 to 48×48), so the resulting ICNS may appear pixelated at larger sizes. For best results, use a high-resolution ICO file.