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File Type of the Day

Today • July 28

.FLAC

Free Lossless Audio Codec File

A FLAC file is an audio file compressed in the Free Lossless Audio Codec (FLAC) format, which is an open-source lossless audio compression format. It is similar to an .MP3 file, but is compressed without losing any quality or original audio data.

July 27

.KEY

Software License Key File

A KEY file contains a license key an application references to register itself to a computer on which it is installed. It may save the key in a plain text format but typically stores an encrypted key string that authenticates the purchase and registers the software.

July 26

.ICNS

macOS Icon Resource

An ICNS file is an icon used by a macOS application. It contains one or more images of varying sizes, saved in the .TIFF format.

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FileInfo.com contains a searchable database of over 10,000 file extensions with detailed information about the associated file types. You can look up information about unknown file types and find programs that open the files. Learn more about FileInfo.com.


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