Home : File Types : ICNS File

.ICNS File Extension

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File TypeMac OS X Icon Resource File

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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. The file is used for displaying the application icon in the Mac OS X Finder and in the OS X dock.

More Information

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.

Programs that open ICNS files
Microsoft Windows LogoWindows
Axialis IconWorkshop
Microsoft Windows Explorer
with the XnShell extension
Mac OS X LogoMac
Apple Preview
Icon Machine
Folder Icon X
Snap Converter
Adobe Photoshop with IconBuilder for Macintosh plugin
Linux LogoLinux
Updated 5/17/2016