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Merged
lkurz merged 3 commits into from
Sep 2, 2026
Merged

Adds hdf4 release 4.0 page #383

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eb2611a
Adds hdf4 release 4.0 page
bmribler Sep 1, 2026
6d8fcd2
Revises the migrating note
bmribler Sep 1, 2026
468cb21
Adds known issue entry for Fortran/64-bit support
bmribler Sep 2, 2026
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63 changes: 63 additions & 0 deletions downloads/hdf4/hdf4_4_0.md
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---
title: HDF 4.4.0
---

<img alt="HDF4 Logo" align=right width=300 src="/assets/img/hdf4.png">

# HDF 4.4.0

## Release Information

| Version | HDF 4.4.0 |
| Release Date | 9/1/2026 |
<tr>
<td style="background-color:#FFFFFF">
![GitHub release (latest by date)](https://img.shields.io/github/v/release/HDFGroup/hdf4?label=Version&color=white)
</td>
<td>
</td>
</tr>
<tr>
<td style="background-color:#FFFFFF">
![GitHub Release Date](https://img.shields.io/badge/dynamic/json?label=Released&query=$.published_at&url=https://api.github.com/repos/HDFGroup/hdf4/releases/latest&color=white)
</td>
<td>
</td>
</tr>
<tr>

| Additional Release Information | [Release Notes](https://github.com/HDFGroup/hdf4/blob/hdf4.4.0/release_docs/RELEASE.txt) |
| Compatibility Reports for 4.4.0 vs 4.3.1 | [C library](https://support.hdfgroup.org/releases/hdf4/v4_4/v4_4_0/downloads/hdf4.4.0-vs-hdf4.3.1-interface_compatibility_report.html)
| | [Java library](https://support.hdfgroup.org/releases/hdf4/v4_4/v4_4_0/downloads/hdf4.4.0-vs-hdf4.3.1-java-interface_compatibility_report.html)

## Downloads

#### NOTE:
Applications that were created with HDF4 releases 3.x and earlier will need to be modified to use the safe version of Vgetname, Vgetclass, and Vinquire introduced in 4.0 release. Refer to the Breaking changes section in the [RELEASE.txt](https://github.com/HDFGroup/hdf4/blob/hdf4.4.0/release_docs/RELEASE.txt) for details.

| File | Type |
| ----- | ---- | --------------------- |
| [hdf4.4.0.tar.gz](https://github.com/HDFGroup/hdf4/releases/download/hdf4.4.0/hdf4.4.0.tar.gz) | Source release |
| [hdf4.4.0.zip](https://github.com/HDFGroup/hdf4/releases/download/hdf4.4.0/hdf4.4.0.zip) | Source release |
| [Ready to use Binaries](https://github.com/HDFGroup/hdf4/releases/tag/hdf4.4.0) | Pre-built binary distributions for Unix and Windows |
| [sha256](https://github.com/HDFGroup/hdf4/releases/download/hdf4.4.0/hdf4.4.0.sha256sums.txt) | Checksum file |

Please refer to [Build Instructions](https://github.com/HDFGroup/hdf4/blob/hdf4.4.0/release_docs/INSTALL) for building with either CMake or Autotools.

#### Known Problems:

o Users should also be aware that, as in previous releases, Fortran
on 64-bit platforms is generally not expected to work and should be
considered unsupported in most configurations. While some compiler and
platform combinations may work, these cases should be viewed as exceptions
rather than the norm.

o Valgrind may report "Conditional jump or move depends on uninitialised
value(s)" in JPEG-related test comparisons when the library is built
against SIMD-enabled libjpeg-turbo. This is a documented false positive
caused by Valgrind mis-tracking libjpeg-turbo's SSE2 color-space
conversion code, not an actual bug in HDF4. It does not occur when
built/run with SIMD disabled (JSIMD_FORCENONE=1). See the libjpeg-turbo
README, "SIMD Extensions" section at:
https://github.com/libjpeg-turbo/libjpeg-turbo/blob/main/README.md#memory-debugger-pitfalls
for details.
5 changes: 3 additions & 2 deletions downloads/index.md
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| Version | Usage |
| ---- | ----|
| [HDF5 2.1.0](https://support.hdfgroup.org/documentation/hdf5/latest/rel_spec_2x.html) | Most recent HDF5 library version. |
| [HDF5 2.2.0](https://support.hdfgroup.org/documentation/hdf5/latest/rel_spec_2x.html) | Most recent HDF5 library version. |
| [HDF5 1.14.6](https://support.hdfgroup.org/documentation/hdf5/latest/rel_spec_114.html) | Last release of the 1.14.x series |

## HDFView
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| Version | Usage |
| ---- | ----|
| [HDF 4.3.1](hdf4/hdf4_3_1.html) | Series 4.3.x contains significant changes in public/private components |
| [HDF 4.4.0](hdf4/hdf4_4_0.html) | Series 4.4.x contains significant changes in public/private components |
| [HDF 4.3.1](hdf4/hdf4_3_1.html) | Series 4.3.x contains significant changes in public/private components - Last release of the 4.3.x series |
| [HDF 4.2.16-2](hdf4/hdf4_2_16-2.html) (Patch Release) | Last release of the 4.2.x series |

## h4h5tools
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