.FF File Extension

2 file types use the .ff file extension.

Call of Duty 4 Fast File

Developer Activision
4.0  |  273 Votes

What is an FF file?

Game data file used by Call of Duty (CoD) first-person shooter games, including Call of Duty 4: Modern Warfare and Call of Duty: Black Ops; saves various game data that are loaded during gameplay.

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NOTE: FF files use a proprietary format and are not intended to be modified by players. Changing the contents of an FF file may cause the game to stop running.

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Programs that open or reference FF files

Farbfeld Image

Developer Laslo Hunhold
4.2  |  5 Votes

An FF file may also be an image saved in the farbfeld image format. It contains an uncompressed image that can be compressed using a variety of image compression formats. FF files are most commonly compressed using bzip2 compression, after which they are saved with the ff.bz2 extension.

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In 2016, Suckless.org debuted farbfeld, a new image file format that "is easy to parse, pipe, and compress." Farbfeld is a loseless format that, unlike the .JPG and .PNG formats, is not tied to a specific kind of image compression. Rather, farbfeld images, which are saved as FF files, can be compressed using a variety of compression algorithms. However, farbfeld's developers suggest that FF file users compress farbfeld images using bzip2 compression (turning the files into .BZ2 files).

Because most popular software applications already use and support the JPG and PNG formats, and because compressing and decompressing FF files using bzip2 or another compression algorithm is less convenient than simply saving images as JPG or PNG files, the FF image format never took off. However, Linux users can still download a number of tools that allow them to create and convert FF images from Suckless.org.

How to open an FF file

Linux users can open an FF image (and convert it to a JPG or PNG file) using the farbfeld library and supporting tools available at Suckless.org. Specifically, lel is an image viewer designed to allow users to open and view FF images.

Programs that open FF files


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