Both the .ico and .icns files are used for icons, albeit in different formats. If you need to convert or export one to another, you have to use some dedicated icon editor or converter. Since both formats are common, it should be not hard to find a tool that can help you convert ico to icns.
Home > Search converters: ico to icns
Conversion of ico file format to icns file format beta
Search for ico to icns converter or software able to handle these file types.
Convert Icon image to Apple icon graphic format.
We have found 6 software records in our database eligible for .ico to .icns file format conversion.
Microsoft Windows software 
- convert ico to icns on Windows
Axialis IconWorkshop
A cross-platform icon making software
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from ico file | Yes, Axialis IconWorkshop supports ico file conversion as a source file type. | Yes | Yes | ico editor | Yes | No | No | No |
to icns file | Yes, Axialis IconWorkshop supports icns file conversion as a target file type. | Yes | Yes | icns editor | Yes | Yes | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned ico to icns. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
IcoFX
A professional icon and cursor editor
Apple macOS / Mac OS X software 
- convert ico to icns on OS X
Preview
A basic document and image viewer in Mac
IconBox
A great icon organizer and tool for Mac OS X
Icons Maker
Icon creator and editor for Mac
Image2icon
Create your own mac icons
Additional links: Open ico file, Open icns file
ICO
Files with ico extension can be typically found as icons, most notably program icons for Windows executables. A single .ico file contains one or more icons in different pixel sizes.
ICNS
Files with icns extension can be usually encountered as icon archives from Mac OS X (macOS). Contains several sizes of icons in a single file.
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