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ZarrThe open foundation for chunked, compressed, N-dimensional arrays

A specification, implementations in 10 languages, and an ecosystem of datasets and tools, built by an open community.

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📐

Specification

An open, versioned format definition with a community-driven enhancement (ZEP) process.

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Implementations

Libraries in 10 languages — Python, Rust, C, C++, Java, JavaScript, Julia, R, OCaml, Elixir.

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Datasets

Petabytes of public, analysis-ready Zarr data across climate, bio-imaging, and beyond.

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Ecosystem

Tools built on Zarr — Xarray, Icechunk, VirtualiZarr, TensorStore, deck.gl-zarr, xpublish, and more.

GitHub org

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Community

ZEPs, office hours, community calls, and governance. Everyone is welcome.

Used by

Implementations

PythonZarr-Python

v2v3

PythonZarrita

v2v3

Rustzarrs

v2v3

C++cpp-zarr

C++GDAL

C++TensorStore

v2v3

C++xtensor-zarr

C++z5

CNetCDF-C

JavaScriptZarr.js

JavaScriptzarrita.js

v2v3

JavaJZarr

v2v3

Javan5-zarr

JavanetCDF-Java

Javazarr-java

v2v3

JuliaZarr.jl

Rpizzarr

RRarr

OCamlzarr-ml

ElixirExZarr

v2v3

ZarrThe open foundation for chunked, compressed, N-dimensional arrays

Specification

Implementations

Datasets

Ecosystem

Community

Used by

Implementations

Sponsored by