Pictures saved as PNGs, pretty much like other images, can be used to create icons, or form whole icon packs like the ICNS format for Mac (OS X). Your best shot would be to use some of the dedicated icon editing and making software like IconWorkshop or utilities like the Image2icon.
Home > Search converters: png to icns
Conversion of png file format to icns file format beta
Search for png to icns converter or software able to handle these file types.
Convert Portable Network Graphic file to Apple icon graphic format.
We have found 2 software records in our database eligible for .png to .icns file format conversion.
Apple macOS / Mac OS X software 
- convert png to icns on OS X
Preview
A basic document and image viewer in Mac
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from png file | No | Yes | No | No | No | No | Yes | No |
to icns file | Yes, Preview supports icns file conversion as a target file type. | Yes | No | No | No | No | 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 png 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.
Image2icon
Create your own mac icons
Additional links: Open png file, Open icns file
PNG
Files with png extensions are commonly used for Portable Network Graphic files. PNG is a bitmap image mainly used on web pages.
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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