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)
Our great sponsors
  • WorkOS - The modern identity platform for B2B SaaS
  • InfluxDB - Power Real-Time Data Analytics at Scale
  • SaaSHub - Software Alternatives and Reviews
zlib-ng uzlib
13 2
1,440 294
1.8% -
9.4 0.0
12 days ago 7 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 2023-09-24.


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.
  • Compression algorithms for HTTP packets
    1 project | /r/arduino | 23 May 2023
    This GitHub repo might have something that works https://github.com/pfalcon/uzlib , according to the author, the compression ratio isn't very high
  • Using TAR files in ESP32 with SD applications for easy multiple file transfers
    3 projects | /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:

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

ZLib - A massively spiffy yet delicately unobtrusive compression library.

sent - a simple plaintext presentation tool

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

Stm32-FatFs-Gzip - This project offers a simplified compressor that produces Gzip-compatible output with small resources for microcontrollers and edge computers. He uses the very basic LZ77 compression algorithm and static Deflate Huffman tree encoding to compress / decompress data into Gzip files.

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

TinyUntar - A tiny untar library written in C.

brotli - Brotli compression format

Owin.Compression - Compression (Deflate / GZip) module for Microsoft OWIN filesystem pipeline. Works with Selfhost and also on AspNetCore.

LZ4 - Extremely Fast Compression algorithm

eiwd - iwd without dbus -- maintained fork of original dylanaraps/eiwd