ANN: C-Blosc2 3.0.0 RC1 is out!

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Francesc Alted

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Mar 27, 2026, 8:35:10 AM (9 days ago) Mar 27
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# Announcing C-Blosc2 3.0.0 RC1
A fast, compressed and persistent binary data store library for C.

## What is new?

We've bumped the major version to introduce variable-length chunks & blocks
(VL-blocks), perfect for irregular data like strings & JSON! Plus, improved
dictionary compression (now with LZ4/LZ4HC!) and key safety fixes.

For more info, see the release notes in:

https://github.com/Blosc/c-blosc2/blob/main/RELEASE_NOTES.md

## What is it?

Blosc2 is a high-performance data container optimized for binary data.
Blosc2 is the next generation of Blosc, an [award-winning]
(https://www.blosc.org/posts/prize-push-Blosc2) library that has been
around for more than a decade.

Blosc2 expands the capabilities of Blosc by providing a higher level
container that is able to store many chunks on it (hence the super-block name).
It supports storing data on both memory and disk using the same API.
Also, it adds more compressors and filters.

## Download sources

The github repository is over here:

https://github.com/Blosc/c-blosc2

Blosc is distributed using the BSD license, see LICENSE.txt
for details.

## Mailing list

There is an official Blosc mailing list at:

bl...@googlegroups.com
https://groups.google.com/g/blosc

## Fosstodon feed

Please follow https://fosstodon.org/@Blosc2 to get informed about the latest developments.


Enjoy Data!
- The Blosc Development Team

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