ICNS to ICO Converter - Convert Mac Icons to Windows ICO Free

How to convert ICNS to ICO

Add your ICNS files. Drop up to 30 .icns files into the box, or browse for them. They are read on your device and never uploaded.
Check the sizes. Every image inside the ICNS shows under the preview. The largest is ticked and used for the ICO.
Pick the icon sizes. Recommended packs 16 to 256 px into one ICO. Sizes the ICNS already has are copied as they are.
Make the ICO and download. Press Make my ICO. One or two icons download directly, more come as a ZIP.

Want to see every size inside an ICNS first? Open it in the ICNS File Viewer.

Why convert ICNS to ICO?

macOS uses .icns for app icons, Windows uses .ico. Windows cannot show an ICNS at all.

Porting an app to Windows, or just want the same icon on both systems? This turns the Mac icon into a Windows one in a few seconds.

Apple's small sizes are kept

Good Mac icons come with hand-tuned 16 and 32 px versions - simpler shapes that stay readable when tiny.

When the ICNS has a size the ICO needs, that artwork is copied as it is instead of shrinking the 1024 px image. The result line under the settings tells you which sizes were copied.

PNG images (macOS 10.7 and newer) - read in every browser.
Old RLE and ARGB images with masks - read too.
JPEG 2000 images (rare, OS X 10.5 era) - only Safari can read them, other browsers skip them.

Which icon sizes do you need?

Size	Where it shows up	Preset
16 x 16	Explorer details view, title bars, tabs	All presets
20, 24, 40	Windows at 125% and 150% display scaling	Windows app
32 x 32	Desktop at 100%, taskbar	All presets
48 x 48	Explorer medium icons	All presets
64 / 128	Large icons and high-DPI screens	Recommended
256 x 256	Extra large icons, Windows 10 and 11 Start	Recommended, Windows app

For a Windows app pick Windows app - it adds the sizes Windows uses at 125% and 150% scaling. Check the result with the Icons Analyzer.

Tips

Where is the ICNS of an app? On a Mac, right-click the app, Show Package Contents, then Contents > Resources.
Need PNG files? ICNS to PNG saves every size as a picture.
Making a Mac icon from scratch? PNG to ICNS builds one from a single image.

Frequently Asked Questions

Drop your .icns file into the box, keep the Recommended sizes or pick a preset, and press Make my ICO.

The icon downloads right away, with every size packed inside one .ico file.

No. The ICNS is read and turned into an ICO in your browser, on your device. Nothing is uploaded.

Yes, when the ICNS has them. Apple's own 16, 32 and 48 px images are copied into the ICO as they are, instead of being shrunk from the big one.

Yes. Mac icons are transparent around the shape, and every ICO size keeps that.

They are JPEG 2000 images, which only Safari can decode. The other sizes still work, and Safari reads all of them.

Yes - ICO to ICNS turns a Windows icon into a Mac one.

Yes. Pick the Website pack preset - you get favicon.ico, PNG sizes, apple-touch-icon, a manifest and the HTML to paste.

Yes. Layers below 256 px are 32-bit bitmaps with a mask and the 256 px layer is a 32-bit PNG - the layout Windows Explorer expects.