Home : File Types : ICNS File

.ICNS File Extension

File TypeMac OS X Icon Resource File

4.1 (58 Votes)
CategorySystem Files


This file is saved in a binary format, which requires a specific program to read its contents.

What is an ICNS file?

An ICNS file is an icon file used by Mac OS X applications. It stores one or more images, typically which were originally .PNG files and supports 1-bit and 8-bit alpha channels. ICNS files are used for displaying the application icon in the Mac OS X Finder and in the OS X dock.

More Information

Screenshot of a .icns file in Apple Preview 10

ICNS file open in Apple Preview 10

ICNS files are generally located within the Contents/Resources/ directory inside the application package. They are also referenced by the application's .PLIST file (Info.plist) using the CFBundleIconFile property.

Mac OS X icon files can be viewed with the Apple Preview program included with Mac OS X. They can also be created using Icon Composer, another utility included with Mac OS X. ICNS files support icon images of 16x16, 32x32, 48x48, 128x128, 256x256, and 512x512 pixels, as well as 1024x1024 pixels as of Mac OS X 10.8 Mountain Lion.

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Programs that open ICNS files
Updated 4/5/2018

About ICNS Files

Our goal is to help you understand what a file with a *.icns suffix is and how to open it.

The Mac OS X Icon Resource file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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