Convert macOS ICNS icon files to Windows ICO format. Perfect for cross-platform development, migrating icons from Mac to Windows, or creating universal app icons. Need the reverse? Try our ICO to ICNS converter or view your icons with the ICNS Viewer.
Building apps for both Mac and Windows? Convert your macOS ICNS icons to ICO for a native Windows experience.
Moving from Mac to Windows? Bring your favorite icons with you by converting them to the native Windows format.
Convert your Mac app icon to ICO format for use as a website favicon. ICO is still the most compatible favicon format.
Use your Mac icons as custom folder icons in Windows Explorer or for personal Windows applications.
Windows ICO files support sizes from 16x16 up to 256x256 pixels. Common sizes include 16x16 (small icon), 32x32 (standard), 48x48 (large), and 256x256 (extra large for Vista and later). Modern Windows uses PNG compression for 256x256 icons.
Since ICNS files typically contain larger images (up to 1024x1024), we can create high-quality ICO icons by scaling down. We use advanced algorithms like Lanczos to maintain sharpness. For best results, ensure your ICNS contains at least a 256x256 image.
Both ICNS and ICO formats support full alpha channel transparency. Your transparent backgrounds will be preserved during conversion when using 32-bit color depth. For older Windows compatibility, you can choose 24-bit or 8-bit color.
Right-click any folder or shortcut, select "Properties", click "Change Icon", then browse to your ICO file. For applications, include the ICO in your project resources. For favicons, upload to your website root as "favicon.ico".
Yes! Select the "Favicon" preset which includes 16x16, 32x32, and 48x48 sizes - the standard favicon dimensions. ICO format is still the most universally supported favicon format across all browsers.