This is the Github Page of 7-Zip ZS with support of additional Codecs. The library used therefore is located here: Multithreading Library

You can install it in two ways:

1. complete setup with additions within the GUI and a modified Explorer context menu
2. only the codec plugin that goes to your existing 7-Zip installation (no GUI changes and no additional Hashers)

1. Zstandard v1.5.7 is a real-time compression algorithm, providing high compression ratios. It offers a very wide range of compression / speed trade-off, while being backed by a very fast decoder.

   • Levels: 1..22

2. Brotli v.1.2.0 is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.

   • Levels: 0..11

3. LZ4 v1.10.0 is lossless compression algorithm, providing compression speed at 400 MB/s per core (0.16 Bytes/cycle). It features an extremely fast decoder, with speed in multiple GB/s per core (0.71 Bytes/cycle). A high compression derivative, called LZ4_HC, is available, trading customizable CPU time for compression ratio.

   • Levels: 1..12

4. LZ5 v1.5 is a modification of LZ4 which was meant for a better ratio at cost of slower compression and decompression. It's superseded by Lizard now.

   • Levels: 1..15

5. Lizard v2.1 is an efficient compressor with fast decompression. It achieves compression ratio that is comparable to zip/zlib and zstd/brotli (at low and medium compression levels) at decompression speed of 1000 MB/s and faster.

   • Levels 10..19 (fastLZ4) are designed to give about 10% better decompression speed than LZ4
   • Levels 20..29 (LIZv1) are designed to give better ratio than LZ4 keeping 75% decompression speed
   • Levels 30..39 (fastLZ4 + Huffman) adds Huffman coding to fastLZ4
   • Levels 40..49 (LIZv1 + Huffman) give the best ratio, comparable to zlib and low levels of zstd/brotli, but with a faster decompression speed

6. Fast LZMA2 v1.0.1 is a LZMA2 compression algorithm, 20% to 100% faster than normal LZMA2 at levels 5 and above, but with a slightly lower compression ratio. It uses a parallel buffered radix matchfinder and some optimizations from Zstandard. The codec uses much less additional memory per thread than standard LZMA2.

   • Levels: 1..9

1. download the setup from here 7-Zip ZS Releases
2. install it, like the default 7-Zip
3. use it ;)
4. you may check, if the 7-Zip can deal with Zstandard or other codecs via this command: 7z.exe i

The output should look like this:

7-Zip 25.01 ZS v1.5.7 (x64) : Copyright (c) 1999- Igor Pavlov, 2016- Tino Reichardt, 2022- Sergey G. Brester : 2025-08-06 Libs: 0 c:\Program Files\7-Zip-Zstandard\7z.dll 1 C:\Program Files\7-Zip-Zstandard\Codecs\Iso7z.64.dll Formats: ... 0 CK xz xz txz (.tar) FD 7 z X Z 00 0 Z z taz (.tar) 1F 9D 0 CK zstd zst zstd tzst (.tar) tzstd (.tar) 0 x F D 2 F B 5 2 5 . . 0 x F D 2 F B 5 2 8 00 0 C F 7z 7z 7 z BC AF ' 1C 0 F Cab cab M S C F 00 00 00 00 ... Codecs: 0 4ED 303011B BCJ2 0 EDF 3030103 BCJ 0 EDF 3030205 PPC 0 EDF 3030401 IA64 0 EDF 3030501 ARM 0 EDF 3030701 ARMT 0 EDF 3030805 SPARC 0 EDF 20302 Swap2 0 EDF 20304 Swap4 0 ED 40202 BZip2 0 ED 0 Copy 0 ED 40109 Deflate64 0 ED 40108 Deflate 0 EDF 3 Delta 0 ED 21 LZMA2 0 ED 30101 LZMA 0 ED 30401 PPMD 0 D 40301 Rar1 0 D 40302 Rar2 0 D 40303 Rar3 0 D 40305 Rar5 0 ED 4F71102 BROTLI 0 ED 4F71104 LZ4 0 ED 4F71106 LIZARD 0 ED 4F71105 LZ5 0 ED 4F71101 ZSTD 0 ED 21 FLZMA2 0 EDF 6F10701 7zAES 0 EDF 6F00181 AES256CBC Hashers: 0 32 202 BLAKE2sp 0 32 204 BLAKE3 0 4 1 CRC32 0 8 4 CRC64 0 16 205 MD2 0 16 206 MD4 0 16 207 MD5 0 20 201 SHA1 0 32 A SHA256 0 48 208 SHA384 0 64 209 SHA512 0 32 20A SHA3-256 0 48 20B SHA3-384 0 64 20C SHA3-512 0 4 20D XXH32 0 8 20E XXH64 

• compression and decompression for Brotli, Lizard, LZ4, LZ5 and Zstandard within the 7-Zip container format
• compression and decompression of Brotli (.br), Lizard (.liz), LZ4 (.lz4), LZ5 (.lz5) and Zstandard (.zst) files
• handling of ZIP files with Zstandard compression
• included lzip decompression support, patch from: https://download.savannah.gnu.org/releases/lzip/7zip/
• explorer context menu: "Add to xy.7z" will use all parameters of the last "Add to Archive" compression dialog (this includes: method, level, dictionary, blocksize, threads and paramters input box)
• squashfs files with LZ4 or Zstandard compression can be handled
• several history settings aren't stored by default, look here for some info about that, you can restore original 7-Zip behavior via tools->options->settings
• these hashes can be calculated: CRC32, CRC64, MD2, MD4, MD5, SHA1, SHA256, SHA384, SHA512, SHA3-256, SHA3-384, SHA3-512, XXH32, XXH64, BLAKE2sp, BLAKE3 (lowercase or uppercase)

7z a archiv.7z -m0=zstd -mx0 Zstandard Fastest Mode, without BCJ preprocessor 7z a archiv.7z -m0=zstd -mx1 Zstandard Fast mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=zstd -mx.. ... 7z a archiv.7z -m0=zstd -mx21 Zstandard 2nd Slowest Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=zstd -mx22 Zstandard Ultra Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=lz4 -mx0 LZ4 Fastest Mode, without BCJ preprocessor 7z a archiv.7z -m0=lz4 -mx1 LZ4 Fast mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=lz4 -mx.. ... 7z a archiv.7z -m0=lz4 -mx12 LZ4 Ultra Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=lz5 -mx0 LZ5 Version 1.5 Fastest Mode, without BCJ preprocessor 7z a archiv.7z -m0=lz5 -mx1 LZ5 Version 1.5 Fast mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=lz5 -mx.. ... 7z a archiv.7z -m0=lz5 -mx16 LZ5 Version 1.5 Ultra Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=flzma2 -mx1 Fast LZMA2 Fastest mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=flzma2 -mx.. ... 7z a archiv.7z -m0=flzma2 -mx9 Fast LZMA2 Ultra Mode, with BCJ preprocessor on executables 7z x -so test.tar.zst | 7z l -si -ttar -> show contents of zstd compressed tar archive test.tar.zst 7z x -so test.tar.lz | 7z l -si -ttar -> show contents of lzip compressed tar archive test.tar.lz 

1. download the Codecs.7z archive from here 7-Zip ZS Releases, this archive holds binaries, which are compatible with the Mainline version of 7-Zip
2. create a new directory named Codecs and put in there the zstd-x32.dll or the zstd-x64.dll, depending on your 7-Zip installation
   • normally, the x32 should go to: "C:\Program Files (x86)\7-Zip\Codecs"
   • the x64 version should go in here: "C:\Program Files\7-Zip\Codecs"
3. you could also replace the 7z.dll directly within C:\Program Files (x86)\7-Zip
4. then you may check if the dll is correctly installed via this command: 7z.exe i

The output should look like this:

7-Zip 21.03 (x64) : Copyright (c) 1999-2021 Igor Pavlov : 2021-05-06 Libs: 0 C:\Program Files\7-Zip\7z.dll Libs: 0 c:\Program Files\7-Zip\7z.dll 1 c:\Program Files\7-Zip\Codecs\brotli-x64.dll 2 c:\Program Files\7-Zip\Codecs\flzma2-x64.dll 3 c:\Program Files\7-Zip\Codecs\lizard-x64.dll 4 c:\Program Files\7-Zip\Codecs\lz4-x64.dll 5 c:\Program Files\7-Zip\Codecs\lz5-x64.dll 6 c:\Program Files\7-Zip\Codecs\zstd-x64.dll ... Codecs: 0 4ED 303011B BCJ2 0 ED 3030103 BCJ 0 ED 3030205 PPC 0 ED 3030401 IA64 0 ED 3030501 ARM 0 ED 3030701 ARMT 0 ED 3030805 SPARC 0 ED 20302 Swap2 0 ED 20304 Swap4 0 ED 40202 BZip2 0 ED 0 Copy 0 ED 40109 Deflate64 0 ED 40108 Deflate 0 ED 3 Delta 0 ED 21 LZMA2 0 ED 30101 LZMA 0 ED 30401 PPMD 0 D 40301 Rar1 0 D 40302 Rar2 0 D 40303 Rar3 0 D 40305 Rar5 0 ED 6F10701 7zAES 0 ED 6F00181 AES256CBC 1 ED 4F71102 BROTLI 2 ED 21 FLZMA2 3 ED 4F71106 LIZARD 4 ED 4F71104 LZ4 5 ED 4F71105 LZ5 6 ED 4F71101 ZSTD 

• compression and decompression for Brotli, Fast LZMA2, Lizard, LZ4, LZ5 and Zstandard within the 7-Zip container format
• you can only create .7z files, the files like .lz4, .lz5 and .zst are not covered by the plugins
• when compressing binaries (*.exe, *.dll), you have to explicitly disable the bcj2 filter via -m0=bcj, when using only the plugin dll's
• so the usage should look like this:

7z a archiv.7z -m0=bcj -m1=zstd -mx1 Fast mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=bcj -m1=zstd -mx.. ... 7z a archiv.7z -m0=bcj -m1=zstd -mx21 2nd Slowest Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=bcj -m1=zstd -mx22 Ultra Mode, with BCJ preprocessor on executables 7z a archiv.7z -m0=bcj -m1=brotli -mxN ... 7z a archiv.7z -m0=bcj -m1=lizard -mxN ... 7z a archiv.7z -m0=bcj -m1=lz4 -mxN ... 7z a archiv.7z -m0=bcj -m1=lz5 -mxN ... 7z a archiv.7z -m0=bcj -m1=flzma2 -mxN ... 

• download TotalCmd.7z
• install it, by replacing the files tc7z.dll and tc7z64.dll with the new ones
• you can check the Total Commander Forum for more information about this DLL Files
• decompression for Brotli, Lizard, LZ4, LZ5 and Zstandard ot the 7-Zip .7z format will work out of the box with Total Commander now :-)

• copy the 7z.dll file from C:\Program Files\7-Zip-Zstandard\7z.dll to C:\Program Files\Far Manager\Plugins\ArcLite\7z.dll
• then restart the Far manager - and on next start, you will have support for 7-Zip Zstandard archives ;-)

For the benchmarks I am using Windows 7 64bit on my Laptop which has the following Hardware:

• Intel i7-3632QM, limited to 2,2GHz, 16GB RAM, disabled swap space
• the compression benchmark is read / written to an 4 GiB ImDisk
• the decompression benchmark is also done in RAM via: 7z t archiv.7z
• the tool for measuring the times is wtime, together with some scripts
• the testfile is generated via generate-mcorpus
• please note, that the benchmarks are outdated now (new one will come, but it needs some time)

• FileManager Toolbar Icon Theme: Glyfz 2016 by AlexGal homepage
• File Types Icon Theme: Windows 10 by masamunecyrus homepage
• Additional icons file types created by Mr4Mike4 homepage

• The same as the Mainline 7-Zip, which means most of the code is GNU LGPL v2.1-or-later
• Read COPYING for more details

• 7-Zip Homepage
• 7-Zip Zstandard Homepage
• Request for inclusion into the mainline 7-Zip:
  • result, will currently not included :(
• p7zip Homepage - for Linux and MacOS with LZ4 and Zstandard

You find this project useful, maybe you consider a donation ;-)

• 7-Zip ZS Version 25.01
  • Brotli Version 1.2.0
  • Fast LZMA2 Version 1.0.1
  • Lizard Version 2.1
  • LZ4 Version 1.10.0
  • LZ5 Version 1.5
  • Zstandard Version 1.5.7

/TR 2025-08-06

• if you want an code signed installer, you need to donate sth.