7.0.0: 25/06/2026

What's Changed

This release includes a change of major version of the embedded c-blosc2 library.

• Added hd5plugin.from_filter_options(filter_id, filter_options) function to create filter instances from hdf5 "cd_values" (PR #366)

• Added hdf5plugin.FilterBase.get_config() method to retrieve parameters as a dict and repr support (PR #373, #376)

• Added support of negative compression levels to hdf5plugin.Zstd (PR #395)

• Fixed type checker re-export compatibility by adding __all__ to __init__.py (PR #381)

• Fixed Bitshuffle's clevel argument supported range (PR #384)

• Updated compression filters:

  • blosc2 hdf5 filter (commit e4d0f58) (PR #383)
  • LZ4 hdf5 filter: Use HDFGroup version (PR #394)
  • Zstd hdf5 filter: Use HDFGroup version (PR #395)

• Updated compression libraries:

  • c-blosc2 library: Change of major version (v3.1.4) (PR #378, #387, #392)
  • SPERR library (v0.8.5) (PR #383)
  • SZ library (commit 308bd06) (PR #392)

• Build:

  • Fixed name of bzip2 plugin (PR #367)
  • Fixed deprecation warning when building wheel (PR #390)
  • Fixed building plugins against libhdf5 v2 (PR #391, #399)

• Misc.:

  • Added tests for variable-width strings support (PR #363)
  • Updated CI release workflow (PR #374, #396)
  • Updated documentation (PR #393, #398)
  • Updated code format/check with ruff (PR #400)

New Contributors

• @crusaderky made their first contribution in #363
• @tiltingpenguin made their first contribution in #367
• @riccardoratta made their first contribution in #381
• @payno made their first contribution in #398

Full Changelog: v6.0.0...v7.0.0

6.0.0: 08/10/2025

What's Changed

This release requires Python >= 3.9 (PR #345).

• Compression filters and libraries:

  • Updated filter: hdf5-blosc2 (PR #342)

  • Updated libraries:

    • SPERR (v0.8.4) (PR #356)
    • snappy (v1.2.2) (PR #353)
    • c-blosc2 (v2.21.2) (PR #353)

  • Deprecated SZ filter (PR #352)

• Build:

  • Removed -ffast-math and /fp:fast compilation flags (PR #349)
  • Fixed build with system libraries on Windows (PR #339)
  • Moved embedded filters source code to a dedicated folder (PR #348)

• Deprecated hdf5plugin.version_info (PR #358)
• Added Python typing (PR #350, #360)
• Code formatting and linting (PR #340, #347)
• Updated project description and changelog (PR #344, #361)

Full Changelog: v5.1.0...v6.0.0

5.1.0: 31/03/2025

What's Changed

• Compression filters and libraries:

  • Updated bitshuffle filter (v0.5.2) (PR #334)
  • Updated h5z-sperr filter (v0.2.3) (PR #335, #336)
  • Updated c-blosc2 compression library (v2.17.1) (PR #334, #337)

• Build:

  • Added HDF5PLUGIN_SYSTEM_LIBRARIES environment variable to build filters with system libraries (PR #333)
  • Fixed HDF5PLUGIN_STRIP=all environment variable to support missing folders (PR #331)

• Updated documentation (PR #323, #338)

• Updated continuous integration configuration (PR #331)

Full Changelog: v5.0.0...v5.1.0

v5.0.0: 30/08/2024

What's Changed

This release requires Python >= 3.8 (PR #301) and h5py >= 3.0.0 (PR #300).

• Removed deprecated constants: hdf5plugin.config, hdf5plugin.date, hdf5plugin.hexversion and hdf5plugin.strictversion (PR #301)

• Compression filters and libraries:

  • Added Sperr filter (PR #303, #322)

  • Updated filters:

    • Fcidecomp (v2.1.1) (PR #311, #320)
    • hdf5-blosc (v1.0.1) (PR #310)
    • LZ4 (commit 49e3b65) (PR #310)
    • SZ (commit f466775) (PR #310)

  • Updated libraries:

    • c-blosc (v1.21.6) (PR #320)
    • c-blosc2 (v2.15.1) (PR #315, #320, #321)
    • CharLS (v2.1.0) (PR #311)
    • LZ4 (v1.10.0) (PR #320)
    • Snappy (v1.2.1) (PR #310)
    • zlib (v1.3.1) (PR #320)
    • ZStd (v1.5.6) (PR #315)

  • Fixed zfp compilation options for Visual Studio 2022 (PR #313)

• Fixed hdf5plugin.Bitshuffle to avoid raising ValueError when lz4=False (PR #309)

• Fixed compilation warning on Windows by removing /openmp link flags (PR #316)

• Added HDF5PLUGIN_CPP20 build configuration environment variables for Sperr (PR #303)

• Updated setup.py (PR #298)

• Updated copyright statement (PR #308)

• Updated documentation (PR #299, #312, #314, #319)

• Updated continuous integration configuration (PR #298, #312,#313, #314)

New Contributors

• @psteinb made their first contribution in #309

Full Changelog: v4.4.0...v5.0.0

4.4.0: 08/02/2024

What's Changed

• blosc2 filter: Added support of blosc2 plugins (PR #295)

• SZ3 filter: Updated tests and documentation (PR #290, #296)

• Updated c-blosc2 (v2.13.2) (PR #287, #291, #293, #295)

• Updated zfp (v1.0.1) (PR #287)

• Added automated release workflow (PR #292, #294)

• Updated documentation (PR #285, #288, #297)

Full Changelog: v4.3.0...v4.4.0

4.4.0b0: 24/01/2024

Release notes

• Updated documentation configuration to accomodate changes in readthedocs by @t20100 in #285
• Updated embedded libraries: c-blosc2 v2.12.0, zfp v1.0.1 by @t20100 in #287
• Documentation: Updated link to hdf5 registered filters by @t20100 in #288
• SZ3 filter: Updated tests by @t20100 in #290
• Updated embedded library: c-blosc2 v2.13.0 by @t20100 in #291
• Added a release github action workflow by @t20100 in #292

Full Changelog: v4.3.0...v4.4.0b0

4.3.0: 09/11/2023

What's Changed

• Updated hdf5-blosc2 to support b2nd (PR #282)

• Updated c-blosc2 (v2.11.1) and enabled its AVX512 support (PR #283)

• Updated continuous integration to test with Python 3.12 (PR #281)

• Added European HDF Users Group (HUG) Meeting 2023 presentation and companion material (PR #280)

• Updated documentation (PR #279, #284)

New Contributors

• @ivilata made their first contribution in #282

Full Changelog: v4.2.0...v4.3.0

4.2.0: 12/09/2023

What's Changed

• Updated libraries: c-blosc (v1.12.5), c-blosc2 (v2.10.2) (PR #273)

• Updated filter H5Z-ZFP (v1.1.1) (PR #273)

• Updated build dependencies:

  • Added wheel>=0.34.0 requirement (PR #272)
  • Removed distutils usage (PR #276)

• Updated documentation (PR #271, #278)

• Fixed Continuous integration (PR #275)

• Debian packaging (PR #277):

  • Added Debian 12
  • Removed Debian 10

Full Changelog: v4.1.3...v4.2.0

4.1.3: 16/06/2023

This is a bug fix release.

What's Changed

• Fixed SZ compression filter build option that was leading to errors higher than the required tolerance (PR #268, #269)

Full Changelog: v4.1.2...v4.1.3

4.1.2: 01/06/2023

What's Changed

• Updated libraries: c-blosc (v1.12.4), c-blosc2 (v2.9.2), snappy (v1.1.10), zstd (v1.5.5), zlib (v1.2.13) (PR #266)
• Updated filter registration (PR #264)

Full Changelog: v4.1.1...v4.1.2