Zarr

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What is it?

The zarr library is a Python implementation of the Zarr storage format. zarr delivers compressed, chunked, N-dimensional arrays that work well for parallel computing and object storage. See the documentation for more information.

Main Features

  • Create N-dimensional arrays with NumPy-compatible dtypes.
  • Chunk arrays along any dimension.
  • Encode chunks using a variety of useful encodings (e.g., compression).
  • Store arrays in memory, on disk, inside a zip file, on S3, etc...
  • Read an array concurrently from multiple threads or processes.
  • Write to an array concurrently from multiple threads or processes.
  • Organize arrays into hierarchies via groups.

Where to get it

Zarr can be installed from PyPI using pip:

pip install zarr

or via conda:

conda install -c conda-forge zarr

For more details, including how to install from source, see the installation documentation.

Repository sub-packages

In addition to the primary zarr implementation, this repository contains other packages that provide specialized functionality with minimal dependencies:

  • zarr-metadata: Tools for Zarr metadata. Install with pip install zarr-metadata.
  • zarr-indexing: Tools for lazily indexing chunked arrays. Install with pip install zarr-indexing.
  • zarr-http-server: An HTTP server implementation targeting Zarr data. Install with pip install zarr-http-server.

Project links

Data verified by PyPI on Sep 15, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

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  • Released:
Latest release

Owner

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5 maintainers

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Data sourced directly from PyPI's database.
Avatar for aliman from gravatar.com aliman Avatar for jakirkham from gravatar.com jakirkham Avatar for maxrjones from gravatar.com maxrjones
+2 more Avatar for rabernat from gravatar.com rabernat Avatar for zarr_dev from gravatar.com zarr_dev

Credits

Author: Alistair Miles

Maintainer: jakirkham, Norman Rzepka, Ryan Abernathey, David Stansby, Deepak Cherian

GitHub Statistics

Data verified by PyPI on Sep 15, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.12

Provides Extra

cast-value-rs cli gpu optional remote

Tags

Python compressed ndimensional-arrays zarr

Classifiers

Report project as malware

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This release

3.4.0 This release

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Yanked reason: broke a certain indexing incantation with our last release. see #2849. This can lead to data corruption

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