zlib-ng VS uzlib

Compare zlib-ng vs uzlib and see what are their differences.


zlib replacement with optimizations for "next generation" systems. (by zlib-ng)


Radically unbloated DEFLATE/zlib/gzip compression/decompression library. Can decompress any gzip/zlib data, and offers simplified compressor which produces gzip-compatible output, while requiring much less resources (and providing less compression ratio of course). (by pfalcon)
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zlib-ng uzlib
4 1
1,084 215
2.3% -
9.5 2.4
5 days ago 8 months ago
zlib License GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of zlib-ng. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-06-20.


Posts with mentions or reviews of uzlib. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-04-04.
  • Using TAR files in ESP32 with SD applications for easy multiple file transfers
    3 projects | reddit.com/r/arduino | 4 Apr 2021
    I am engineering a watch to play home videos of my children on my wrist - my Reflections project. I need an easy way to move multiple files from a Cloud based service to the watch. tar) and GZip are widely used standards to build and compress an archive of binary (for example, movies and sound files) and text (for example, JSON encoded procedural scripting command) files. Using tar I simplify my code to move one tar file instead of multiple individual files. The ESP32-targz library combines uzlib and TinyUntar to decompress and inflate tar files and works well with Arduino IDE 1.8.13, ESP32, and an SD card. This is my developer’s journal of the problems that I encountered and the work-arounds I used.

What are some alternatives?

When comparing zlib-ng and uzlib you can also consider the following projects:

ZLib - A massively spiffy yet delicately unobtrusive compression library.

zstd - Zstandard - Fast real-time compression algorithm

ESP32-targz - 🗜️ An Arduino library to unpack/uncompress tar, gz, and tar.gz files on ESP32 and ESP8266

brotli - Brotli compression format

Minizip-ng - Fork of the popular zip manipulation library found in the zlib distribution.

Snappy - A fast compressor/decompressor

LZ4 - Extremely Fast Compression algorithm

libdeflate - Heavily optimized library for DEFLATE/zlib/gzip compression and decompression

libspng - Simple, modern libpng alternative

LZHAM - Lossless data compression codec with LZMA-like ratios but 1.5x-8x faster decompression speed, C/C++

FiniteStateEntropy - New generation entropy codecs : Finite State Entropy and Huff0

KArchive - Qt 5 addon providing access to numerous types of archives