Several Apple apps including the basic Preview from macOS / OS X can access icons from .icns packages 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 TIFF file.
Home > Search converters: icns to tiff
Conversion of icns file format to tiff file format beta
Search for icns to tiff converter or software able to handle these file types.
Convert Apple icon graphic format to Aldus Tagged Image File Format (TIFF) bitmap image.
We have found 2 software records in our database eligible for .icns to .tiff file format conversion.
Articles and other information relating to icns into tiff 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 tiff 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 tiff file | Yes, Preview supports tiff 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 icns to tiff. 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
Additional links: Open icns file, Open tiff 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.
TIFF
Files with tiff extension are bitmap images in the Tagged Image File Format. Usually having the extension TIF, it's one of the more common graphics file types.
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