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7-Zip 21.07 – Free File Archiver

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7-Zip 21.07 – Free File Archiver

7-Zip is an open source file archiver with the high compression ratio predominantly for the Microsoft Windows operating system.

It operates either as a command line program or with a graphical user interface. It also features integration with the Windows shell environment.

Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And it compresses to zip format 2-10% better than most of other zip compatible programs.

7-Zip is free software, developed by Igor Pavlov and distributed under the GNU LGPL license. This file archiver works on all Windows operating systems, from Windows NT to 10 (32-bit and 64-bit).

The main features of 7-Zip:

  • High compression ratio in new 7z format with LZMA compression and LZMA2 compression
  • For ZIP and GZIP formats, the provided compression ratio is 2-10 % better than the ratio provided by PKZip and WinZip
  • Strong AES-256 encryption in 7z and ZIP formats
  • Self-extracting capability for 7z format
  • Integration with Windows Shell
  • Powerful File Manager
  • Powerful command line version
  • Plugin for FAR Manager
  • Localizations for 87 languages
  • Supported formats:
    • Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM

Changes in 7-Zip 21.07 (2021-12-27):

  • 7-Zip now can extract VHDX disk images (Microsoft Hyper-V Virtual Hard Disk v2 format).
  • New switches: -spm and -im!{file_path} to exclude directories from processing for specified paths that don’t contain path separator character at the end of path.
  • In the “Add to Archive” window, now it is allowed to use -m prefix for “Parameters” field as in command line: -mparam.
  • The sorting order of files in archives was slightly changed to be more consistent for cases where the name of some directory is the same as the prefix part of the name of another directory or file.
  • TAR archives created by 7-Zip now are more consistent with archives created by GNU TAR program.

Changes in 7-Zip 21.06 (2021-11-25):

  • The window “Add to Archive” now allows to set a limit on memory usage (RAM) that will be used for compressing.
  • New switch -mmemuse={N}g / -mmemuse=p{N} to set a limit on memory usage (RAM) for compressing and decompressing.
  • Bug in versions 21.00-21.05 was fixed:
    7-Zip didn’t set attributes of directories during archive extracting.
  • Some bugs were fixed.

Changes in 7-Zip 21.04 Beta (2021-11-02):

  • 7-Zip now reduces the number of working CPU threads for compression, if RAM size is not enough for compression with big LZMA2 dictionary.
  • 7-Zip now can create and check “file.sha256” text files that contain the list of file names and SHA-256 checksums in format compatible with sha256sum program. 7-Zip can work with such checksum files as with archives, but these files don’t contain real file data.
    The context menu commands to create and test “sha256” files:
    7-Zip  /  CRC SHA  /  SHA-256 -> file.sha256
    7-Zip  /  CRC SHA  /  Test Archive : Checksum

The commands for command line version:

    7z a -thash file.sha256 *.txt
    7z t -thash file.sha256
    7z t -thash -shd. file.sha256 
  • New -shd{dir_path} switch to set the directory that is used to check files referenced by “file.sha256” file for “Test” operation. If -shd{dir_path} is not specified, 7-Zip uses the directory where “file.sha256” is stored.
  • New -xtd switch to exclude directory items from processing.

Changes in 7-Zip 21.03 Beta (2021-07-21):

  • The maximum dictionary size for LZMA/LZMA2 compressing was increased to 4 GB (3840 MiB).
  • Minor speed optimizations in LZMA/LZMA2 compressing.

Changes in 7-Zip 21.02 Alpha (2021-05-06):

  • 7-Zip now writes additional field for filename in UTF-8 encoding to zip archives.
    It allows to extract correct file name from zip archives on different systems.
  • The command line version of 7-Zip for macOS was released.
  • The speed for LZMA and LZMA2 decompression in arm64 versions for macOS and Linux was increased by 20%-60%.
  • Some changes and improvements in ZIP, TAR and NSIS code.

Changes in 7-Zip 21.01 Alpha (2021-03-10):

  • The command line version of 7-Zip for Linux was released.
  • The improvements for speed of ARM64 version using hardware CPU instructions for AES, CRC-32, SHA-1 and SHA-256.
  • The bug in versions 18.02 – 21.00 was fixed: 7-Zip could not correctly extract some ZIP archives created with xz compression method.
  • Some bugs were fixed.

Changes in 7-Zip 21.00 Alpha (2021-01-19):

  • Some internal changes in code.
  • Some bugs were fixed.
  • New localizations: Tajik, Uzbek (Cyrillic)

Changes in 7-Zip 20.02 Alpha (2020-08-08):

  • The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.
    It allows to increase the compression speed for big 7z archives, if there is a big number
    of CPU cores and threads.
  • The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives.
  • The new -ssp switch. If the switch -ssp is specified, 7-Zip doesn’t allow the system
    to modify “Last Access Time” property of source files for archiving and hashing operations.
  • Some bugs were fixed.
  • New localization: Swahili.

Homepage –

Supported Operating Systems:

  • Windows XP, Vista, 7, 8, 8.1, 10 (32-bit, 64-bit).
  • Windows Server 2003, 2008, 2012, 2016, 2019.

Leave a Reply

8 Comments on 7-Zip 21.07 – Free File Archiver

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    Misleading bug - 7-Zip 21.05 is no longer in beta.

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    "Verified" 7-Zip can extract RAR5 in Beta 15.06

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    From the developer Igor Pavlov: "Some modules from "Extra" package were moved to LZMA SDK. 7-Zip 9.35 beta for 99.99% is same code as 9.34 alpha. Only some bugs were fixed. My latest changes in code for 7-Zip are under development still, so they are not included to 7-Zip 9.35 beta. So now I have two branches of code: 9.35 and "next_version" code. It's more difficult to support two branches. But at least now I can fix simple bugs faster and release fixed versions." Looks like faster beta roll outs are coming.

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    Still having ISO issues and no RAR5 support.

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    Wow, 9.31 Alpha just locked up explorer testing a file.. Win7 64bit.

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    try 7zip sfx maker (freeware)  Thanks for the update.

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    7Zip does have a self extracting function. Use Add to Archive and in Options box you'll see 'Create SFX archive' check box.

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    Thanks for the update