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This web site is no longer updated (but will remain online).
Please see The HDF Group's new Support Portal for the latest information.

WELCOME to the HDF4 Home Page!

The latest Official Release of HDF is 4.2.13

HDF4 (also known as HDF) is a library and multi-object file format for storing and managing data between machines. There are two versions of HDF technologies that are completely different: HDF4 and HDF5. HDF4 is the first HDF format.

PLEASE NOTE that although HDF4 is still funded, new products should be developed in HDF5. See this FAQ for details.

- - Last modified: 28 June 2017