Python-Blosc2

A fast & compressed ndarray library with a flexible compute engine

Author:: The Blosc development team
Contact:: blosc@blosc.org
Github:: https://github.com/Blosc/python-blosc2
Actions:
PyPi:
NumFOCUS:
Code of Conduct:

What is Python-Blosc2?

Python-Blosc2 is a high-performance compressor, compute engine, and format for binary data containers that are portable and open-source. It comes with a lazy expression engine allowing for complex calculations on compressed data, whether stored in memory, on disk, or over the network (e.g., via Caterva2). It is especially optimized for storing and retrieving data from N-dimensional arrays (NDArray) and columnar tables (CTable), complemented by a query/indexing layer. The main use case is fast, compressed, out-of-core numerical data — especially when data is too large to fit comfortably in RAM.

C-Blosc2 is used under the hood as its compression backend. Written in C, and building on its predecessor C-Blosc, C-Blosc2 aims to be an extremely fast meta-compressor for binary data, supporting a diverse set of strategies, and with an extensible plugin architecture for a wide range of codecs and filters.

More info: https://www.blosc.org/python-blosc2/getting_started/overview.html

Installing

Binary packages are available for major OSes (Win, Mac, Linux) and platforms. Install from PyPI using pip:

pip install blosc2 --upgrade

Conda users can install from conda-forge:

conda install -c conda-forge python-blosc2

Command line tools

Two CLI tools are installed along with the package:

b2view: an interactive terminal browser (TUI) for TreeStore bundles (.b2d directories or .b2z files), with paged views of NDArray and CTable data of any size (walkthrough; requires pip install "blosc2[tui]").
parquet-to-blosc2: converts Parquet files to Blosc2 columnar table stores, and back (walkthrough; requires pip install "blosc2[parquet]").

Documentation

The documentation is available here:

https://blosc.org/python-blosc2/python-blosc2.html

You can find examples at:

https://github.com/Blosc/python-blosc2/tree/main/examples

A tutorial from PyData Global 2025 is available at:

https://github.com/Blosc/PyData-Global-2025-Tutorial

(Click here to watch the video recording of the tutorial)

It contains Jupyter notebooks explaining the main features of Python-Blosc2.

License

This software is licensed under a 3-Clause BSD license. A copy of the python-blosc2 license can be found in LICENSE.txt.

Discussion forum

Discussion about this package is welcome at:

https://github.com/Blosc/python-blosc2/discussions

Thanks

Blosc2 is supported by the NumFOCUS foundation, the LEAPS-INNOV project and ironArray SLU, among many other donors. This allowed the following people to have contributed in an important way to the core development of the Blosc2 library:

Francesc Alted
Marta Iborra
Luke Shaw
Aleix Alcacer
Oscar Guiñón
Juan David Ibáñez
Ivan Vilata i Balaguer
Oumaima Ech.Chdig
Ricardo Sales Piquer

In addition, other people have participated in the project in different aspects:

Jan Sellner, contributed the mmap support for NDArray/SChunk objects.
Dimitri Papadopoulos, contributed a large bunch of improvements to many aspects of the project. His attention to detail is remarkable.
And many others that have contributed with bug reports, suggestions and improvements.

Developed using JetBrains IDEs.

Citing Blosc

You can cite our work on the various libraries under the Blosc umbrella as follows:

@ONLINE{blosc,
  author = {{Blosc Development Team}},
  title = "{A fast, compressed and persistent data store library}",
  year = {2009-2026},
  note = {https://blosc.org}
}

Support Blosc for a Sustainable Future

If you find Blosc useful and want to support its development, please consider making a donation or contract to the Blosc Development Team. Thank you!

Compress Better, Compute Bigger

Metadata

Release files for blosc2 4.9.1

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for blosc2 4.9.1
File	Size	Uploaded
blosc2-4.9.1.tar.gz	6.1 MB	Jul 17, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for blosc2 4.9.1
File	Interpreter	ABI	Platform	Reset
blosc2-4.9.1-cp314-cp314t-win_amd64.whl 4.5 MB Jul 17, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-64	Details
blosc2-4.9.1-cp314-cp314t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 7.3 MB Jul 17, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
blosc2-4.9.1-cp314-cp314t-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl 6.7 MB Jul 17, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64	Details
blosc2-4.9.1-cp314-cp314t-macosx_11_0_arm64.whl 5.4 MB Jul 17, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 11.0+ ARM64	Details
blosc2-4.9.1-cp314-cp314t-macosx_10_15_x86_64.whl 6.2 MB Jul 17, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 10.15+ x86-64	Details
blosc2-4.9.1-cp314-cp314-win_amd64.whl 4.5 MB Jul 17, 2026	CPython 3.14	CPython 3.14	Windows x86-64	Details
blosc2-4.9.1-cp314-cp314-pyemscripten_2026_0_wasm32.whl 2.3 MB Jul 17, 2026	CPython 3.14	CPython 3.14	PyEmscripten 2026.0+ WebAssembly	Details
blosc2-4.9.1-cp314-cp314-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 7.3 MB Jul 17, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
blosc2-4.9.1-cp314-cp314-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl 6.8 MB Jul 17, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64	Details
blosc2-4.9.1-cp314-cp314-macosx_11_0_arm64.whl 5.4 MB Jul 17, 2026	CPython 3.14	CPython 3.14	macOS 11.0+ ARM64	Details
blosc2-4.9.1-cp314-cp314-macosx_10_15_x86_64.whl 6.2 MB Jul 17, 2026	CPython 3.14	CPython 3.14	macOS 10.15+ x86-64	Details
blosc2-4.9.1-cp313-cp313-win_amd64.whl 4.4 MB Jul 17, 2026	CPython 3.13	CPython 3.13	Windows x86-64	Details
blosc2-4.9.1-cp313-cp313-pyemscripten_2025_0_wasm32.whl 2.4 MB Jul 17, 2026	CPython 3.13	CPython 3.13	PyEmscripten 2025.0+ WebAssembly	Details
blosc2-4.9.1-cp313-cp313-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 7.3 MB Jul 17, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
blosc2-4.9.1-cp313-cp313-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl 6.8 MB Jul 17, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64	Details
blosc2-4.9.1-cp313-cp313-macosx_11_0_arm64.whl 5.4 MB Jul 17, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ ARM64	Details
blosc2-4.9.1-cp313-cp313-macosx_10_13_x86_64.whl 6.2 MB Jul 17, 2026	CPython 3.13	CPython 3.13	macOS 10.13+ x86-64	Details
blosc2-4.9.1-cp312-cp312-win_amd64.whl 4.4 MB Jul 17, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
blosc2-4.9.1-cp312-cp312-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 7.3 MB Jul 17, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
blosc2-4.9.1-cp312-cp312-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl 6.8 MB Jul 17, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64	Details
blosc2-4.9.1-cp312-cp312-macosx_11_0_arm64.whl 5.4 MB Jul 17, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
blosc2-4.9.1-cp312-cp312-macosx_10_13_x86_64.whl 6.2 MB Jul 17, 2026	CPython 3.12	CPython 3.12	macOS 10.13+ x86-64	Details
blosc2-4.9.1-cp311-cp311-win_amd64.whl 4.4 MB Jul 17, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
blosc2-4.9.1-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 7.3 MB Jul 17, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
blosc2-4.9.1-cp311-cp311-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl 6.8 MB Jul 17, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64	Details
blosc2-4.9.1-cp311-cp311-macosx_11_0_arm64.whl 5.4 MB Jul 17, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
blosc2-4.9.1-cp311-cp311-macosx_10_9_x86_64.whl 6.1 MB Jul 17, 2026	CPython 3.11	CPython 3.11	macOS 10.9+ x86-64	Details

Total release size: 161.3 MB

Release files / blosc2-4.9.1.tar.gz

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Release files / blosc2-4.9.1-cp314-cp314t-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl

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Release files / blosc2-4.9.1-cp314-cp314-pyemscripten_2026_0_wasm32.whl

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Release files / blosc2-4.9.1-cp314-cp314-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl

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Release files / blosc2-4.9.1-cp314-cp314-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl

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Release files / blosc2-4.9.1-cp312-cp312-win_amd64.whl

Download URL	blosc2-4.9.1-cp312-cp312-win_amd64.whl
Size	4.4 MB
Tags	CPython 3.12 Windows x86-64
SHA-256 checksum How to use checksums	`93e3950106e0235ca074a32eca210319595c6f9122b657db21a4fb6238d8699d`
BLAKE2b-256 checksum How to use checksums	`c62f2b6c5dde045f273122004f91dc7d0a2b93cd20087f5906a335355fd3150c`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp312-cp312-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl

Download URL	blosc2-4.9.1-cp312-cp312-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
Size	7.3 MB
Tags	CPython 3.12 Linux glibc 2.27+ x86-64 Linux glibc 2.28+ x86-64
SHA-256 checksum How to use checksums	`b9e53a7346c3c6ff91302553297d5ce68b8af535a6b0c5d95f33aa4eb79b4d92`
BLAKE2b-256 checksum How to use checksums	`6c98e447ddc243614165b2e70ff235f0a98e663946efd809792feb863dfb88cb`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp312-cp312-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl

Download URL	blosc2-4.9.1-cp312-cp312-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl
Size	6.8 MB
Tags	CPython 3.12 Linux glibc 2.27+ ARM64 Linux glibc 2.28+ ARM64
SHA-256 checksum How to use checksums	`9fc283350e6310899c13e1ecda249c04dc7f58dee00a0b01f5aaedd6e38b4ddf`
BLAKE2b-256 checksum How to use checksums	`3cd71eb89562cc1c0d463d657cacb119053ddc585b1d229fba57e8bfd6894700`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp312-cp312-macosx_11_0_arm64.whl

Download URL	blosc2-4.9.1-cp312-cp312-macosx_11_0_arm64.whl
Size	5.4 MB
Tags	CPython 3.12 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`e9dac961f1e65fd33d3dccee998b34ac569dbb60c5715c0f63cb9afc0e17af89`
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Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp312-cp312-macosx_10_13_x86_64.whl

Download URL	blosc2-4.9.1-cp312-cp312-macosx_10_13_x86_64.whl
Size	6.2 MB
Tags	CPython 3.12 macOS 10.13+ x86-64
SHA-256 checksum How to use checksums	`cf8e32e6e52799c841193ccc3f005fbeb5f1ca205c5ffcdc7b2ec8550bf70731`
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Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp311-cp311-win_amd64.whl

Download URL	blosc2-4.9.1-cp311-cp311-win_amd64.whl
Size	4.4 MB
Tags	CPython 3.11 Windows x86-64
SHA-256 checksum How to use checksums	`7bb76b967b9669507525bc8dbe9905d8b71b658f355d5dc596a27202c4ff5d88`
BLAKE2b-256 checksum How to use checksums	`52752a49217ae42f170684fb9e3001a7e566a2dd454be23504af6ccf63659199`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl

Download URL	blosc2-4.9.1-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
Size	7.3 MB
Tags	CPython 3.11 Linux glibc 2.27+ x86-64 Linux glibc 2.28+ x86-64
SHA-256 checksum How to use checksums	`70ac9eb0eb82a33f2cec25759c2607bb6aa52dd32da6b6d0ec2a52315bedd4f1`
BLAKE2b-256 checksum How to use checksums	`ef8df78ceadd7daee81e1ada2f393081823a623e698ad15bc3aefb971101b474`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp311-cp311-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl

Download URL	blosc2-4.9.1-cp311-cp311-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl
Size	6.8 MB
Tags	CPython 3.11 Linux glibc 2.27+ ARM64 Linux glibc 2.28+ ARM64
SHA-256 checksum How to use checksums	`53b5e009ba85d4baa496e1d7e55dfec8d5e1f1f920b3eaad04773009027501d2`
BLAKE2b-256 checksum How to use checksums	`dced63fdd02d4e1df314747cf2e9760fad48fcd0be9b5869f9d4bf0df9eee27e`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp311-cp311-macosx_11_0_arm64.whl

Download URL	blosc2-4.9.1-cp311-cp311-macosx_11_0_arm64.whl
Size	5.4 MB
Tags	CPython 3.11 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`cf85fc731b978af2f75e5e6c9d1c5b4eb7cb211f709a53b2652b4b7cc4d6cb27`
BLAKE2b-256 checksum How to use checksums	`a8dfafd7659639eb189c45be00a96b5bb4726ae37ee1067e0f9bc8f2f5f47791`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Release files / blosc2-4.9.1-cp311-cp311-macosx_10_9_x86_64.whl

Download URL	blosc2-4.9.1-cp311-cp311-macosx_10_9_x86_64.whl
Size	6.1 MB
Tags	CPython 3.11 macOS 10.9+ x86-64
SHA-256 checksum How to use checksums	`801e558d31764c3c3ee9d2fe2fe330021596f5ccae7a14fede4b0de90e510420`
BLAKE2b-256 checksum How to use checksums	`4c26bac4cb9f0c6ab6b8b8bf7670114ce98bdae5dd97fa82368115856126e6a0`
Upload date	Jul 17, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.12`