A Massively Spiffy Yet Delicately Unobtrusive Compression Library
(Also Free, Not to Mention Unencumbered by Patents)

(Not Related to the Linux zlibc Compressing File-I/O Library)

Welcome to the zlib home page, web pages originally created by Greg Roelofsand maintained by Mark Adler.If this page seems suspiciously similar to the PNG Home Page, rest assuredthat the similarity is completely coincidental. No, really.

zlib was written byJean-loup Gailly (compression) andMark Adler(decompression).

Current release:

zlib 1.2.11

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January 15, 2017

Version 1.2.11 has these key improvements over 1.2.10:

• Fix deflate stored bug when pulling last block from window
• Permit immediate deflateParams changes before any deflate input

Due to the bug fixes, any installations of 1.2.9 or 1.2.10 should be immediately replaced with 1.2.11.

Version 1.2.10 has these key improvements over 1.2.9:

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• Fix bug in deflate_stored() for zero-length input
• Fix bug in gzwrite.c that produced corrupt gzip files

Version 1.2.9 has these key improvements over 1.2.8:

• Improve compress() and uncompress() to support large lengths
• Allow building zlib outside of the source directory
• Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
• Fix bugs in creating a very large gzip header
• Add uncompress2() function, which returns the input size used
• Dramatically speed up deflation for level 0 (storing)
• Add gzfread() and gzfwrite(), duplicating the interfaces of fread() and fwrite()
• Add crc32_z() and adler32_z() functions with size_t lengths
• Many portability improvements

You can also look at the complete Change Log.

Canonical URL: http://zlib.net/ (US)

zlib is designed to be a free,general-purpose, legally unencumbered -- that is, not covered by any patents-- lossless

Code to generate any CRC, with a list of CRC descriptions.crcany.c can take a description of a CRC and compute that CRC efficiently. It includes bit-wise, table-driven byte-wise, and table-driven word-wise CRC algorithms.

Code to modify a message so that it generates the desired CRC.spoof.c takes an abbreviated description of the CRC, the exclusive-or of the current CRC of the message and the desired CRC, the length of the message, and a list of bit locations in a message, and tells you which of those bits should be inverted in the message to get the desired CRC. Note that it does not need the message itself, due to the linearity property of CRCs.

ZIP File Processing Bonus Software

Code to read a zip file as a stream and extract its contents.sunzip.c will read a zip file from stdin and extract the files therein that use compression methods 0, 8, 9, or 12 (stored, deflate, deflate64, or bzip2). It accepts Zip64 input.

Code to merge multiple zip files into a single zip file.zipknit.c accepts Zip64 input files, and will create Zip64 output if the combined size of the merged zip file warrants it. All compression formats are permitted, since no decompression or recompression is performed. Encrypted entries are permitted, and pass through unscathed.

Related External Links

zlib for Linux, both shared and static plus headers (RPM format, many architectures)

zlib for Solaris (alternate)

zlib for macOS (Mac OS X): zlib is already included as part of macOS

zlib for Palm Pilot

zlib for Newton OS

zlib for Windows CE

zlib for Windows 9x/NT/2000/XP/2003 (DLL version, plus related utilities)

zlib for Windows 9x/NT (DLL and static version)

DotNetZip zip file manipulation for .NET, and more (including replacements for the buggy Microsoft GZipStream and DeflateStream classes)

zlib for .NET in C#

zlib DLL wrapper for .NET in C#

Zip for .NET

Mark Nelson's ZlibTool article (January 1997)

zlib C++ wrapper for the gz* functions.

C++ zlib and gzip filters in an iostream framework.

zlib 32-bit OCX (C++ source and binaries for use with Visual Basic 4.x or Delphi 2.0)

(unsupported VB5 binary also available)

zlib Delphi 5 interface

(includes compiled object files and corresponding C++ Builder 5 project files)

zlib Perl interface (source code; look for Compress-Zlib*.tar.gz)

zlib Python interface (online manual; part of the standard library as of Python 1.5)

zlib Tcl interface mkZiplib

zlib Haskell interface

zlib Java interface (see also JAR format)

zlib reimplementation in pure Java

(not tested by us, but looks like a good alternative to java.util.zip)

Mark Nelson's JavaZip article (with source code) (December 1997)

Random access for gzip archives, for Java

Gilles Vollant's zlib-based mini-zip and mini-unzip

(see also Info-ZIP's UnZip, which optionally can be compiled with zlib)

Scott Ludwig's zlib-based CExe executable compressor for Win32

zlib technical issues, including spec errors

zlib information in Japanese

zlib information in Russian

Real World Scanning and Halftones (second edition includes a section on zlib)

Markus Oberhumer's LZO `real-time' data compression library

(not tested by us, but looks like a good alternative if you need more speed and less compression)

lz4, a very fast compression algorithm

(not tested by us, but looks like an even better alternative if you need more speed and less compression)

Zstandard, a better compression algorithm

(not tested by us, but appears to be a better alternative to zlib in both dimensions of compression and speed, as well as decompression speed)

libbzip2

(not tested by us, but looks like a good alternative if you need more compression and less speed)

PPP Deflate Protocol (RFC 1979)

Info-ZIP Home Page

Portable Network Graphics (PNG) Home Page

gzip Home Page

pigz (parallel gzip) Home Page

DataCompression.info

comp.compression Frequently Asked Questions list

Send comments or questions about zlib to the authors at after checking FAQ andmanual.
Please report broken links to(PGP key).

This page last updated December 15^th, 2017.

Web page copyright © 1996-2017 Greg Roelofs, Jean-loup Gailly and Mark Adler. zlib software copyright © 1995-2017 Jean-loup Gailly and Mark Adler.

zlib.org domain name donated by Andrew Green.