Several Apple apps including the basic Preview from macOS / Mac OS X can access icons from ICNS package and export the individual icons as normal images. Just make sure you export the icon of the file size you want and save it as JPG file.
Home > Search converters: icns to jpg
Conversion of icns file format to jpg file format beta
Search for icns to jpg converter or software able to handle these file types.
Convert Apple icon graphic format to JPEG bitmap image.
We have found 3 software records in our database eligible for .icns to .jpg file format conversion.
Articles and other information relating to icns into jpg conversion:
How to get png or jpg icon from an app on Mac - Export icons from ICNS file format to PNG or JPG images on your Mac by using Finder and default OS X Preview app.
Apple macOS / Mac OS X software 
- convert icns to jpg on OS X
Preview
A basic document and image viewer in Mac
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from icns file | Yes, Preview supports icns file conversion as a source file type. | Yes | No | No | No | No | Yes | No |
to jpg file | Yes, Preview supports jpg file conversion as a target file type. | No | 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 icns to jpg. 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.
IconBox
A great icon organizer and tool for Mac OS X
Image2icon
Create your own mac icons
Additional links: Open icns file, Open jpg file
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.
JPG
Files with jpg file extension contain pictures, digital photos, and other bitmap images. It is one of the most common image formats used today.
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