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PyFFI is a Python library for processing block structured files.

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The Python File Format Interface, briefly PyFFI, is an open source Python library for processing block structured binary files:

  • Simple: Reading, writing, and manipulating complex binary files in a Python environment is easy! Currently, PyFFI supports the NetImmerse/Gamebryo NIF and KFM formats, CryTek's CGF format, the FaceGen EGM format, the DDS format, and the TGA format.
  • Batteries included: Many tools for files used by 3D games, such as optimizers, stripifier, tangent space calculator, 2d/3d hull algorithms, inertia calculator, as well as a general purpose file editor QSkope (using PyQt4), are included.
  • Modular: Its highly modular design makes it easy to add support for new formats, and also to extend existing functionality.


Get PyFFI from Sourceforge, or install it with:

easy_install -U PyFFI

To get the latest (but possibly unstable) code, clone PyFFI from its Git repository:

git clone --recursive git://

Be sure to use the --recursive flag to ensure that you also get all of the submodules.

If you wish to code on PyFFI and send your contributions back upstream, get a github account and fork PyFFI.


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