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AfterDawn > Software downloads > Desktop > Compression tools > 7-Zip > Version history

Version history for 7-Zip

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Changes for v18.06 - v19.00

Encryption strength for 7z archives was increased:
the size of random initialization vector was increased from 64-bit to 128-bit,
and the pseudo-random number generator was improved.
Some bugs were fixed.

Changes for v18.05 - v18.06

The speed for LZMA/LZMA2 compressing was increased by 3-10%,
and there are minor changes in compression ratio.
Some bugs were fixed.
The bug in 7-Zip 18.02-18.05 was fixed: there was memory leak in xz decoder.
7-Zip 18.02-18.05 used only one CPU thread for bz2 archive creation.

Changes for v18.01 - v18.03 beta

The speed for single-thread LZMA/LZMA2 decoding
was increased by 30% in x64 version and by 3% in x86 version.
7-Zip now can use multi-threading for 7z/LZMA2 decoding,
if there are multiple independent data chunks in LZMA2 stream.
7-Zip now can use multi-threading for xz decoding,
if there are multiple blocks in xz stream.
New localization: Kabyle.
Some bugs were fixed.
What's new after 7-Zip 18.02 beta:
The bug in 18.02 beta was fixed. It could not create xz archive from GUI.

Changes for v18.01 - v18.02 beta

The speed for single-thread LZMA/LZMA2 decoding
was increased by 30% in x64 version and by 3% in x86 version.
7-Zip now can use multi-threading for 7z/LZMA2 decoding,
if there are multiple independent data chunks in LZMA2 stream.
7-Zip now can use multi-threading for xz decoding,
if there are multiple blocks in xz stream.
New localization: Kabyle.
Some bugs were fixed.

Changes for v16.04 - v18.01

Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
7-Zip now uses additional memory buffers for multi-block LZMA2 compression.
CPU utilization was slightly improved.
7-zip now creates multi-block xz archives by default. Block size can be
specified with -ms[Size]{m|g} switch.
xz decoder now can unpack random block from multi-block xz archives.
7-Zip File Manager now can open nested multi-block xz archives
(for example, image.iso.xz) without full unpacking of xz archive.
7-Zip now can create zip archives from stdin to stdout.
ZIP unpacking code was improved.
7-Zip now can unpack OBJ/COFF files.
7-Zip now can unpack DMG archives that use LZFSE compression method.
7-Zip now doesn't allow update operation for archives that have read-only attribute.
7-Zip command line: @listfile now doesn't work after -- switch.
Use -i@listfile before -- switch instead.
new -sse switch to stop archive creating, if 7-Zip can't open some input file.
7-Zip now reserves file space before writing to file (for extraction from archive).
It can reduce file fragmentation.
Internal changes in code.
The BUGs were fixed:
7-Zip could add unrequired alternate file streams to WIM archives,
for commands that contain filename wildcards and -sns switch.
Extracting from tar with -si switch didn't set timestamps for directories.
Some bugs were fixed. 7-Zip could crash in some cases.

Changes for v16.04 - v17.00 beta

ZIP unpacking code was improved.
7-Zip now reserves file space before writing to file (for extraction from archive).
It can reduce file fragmentation.
Some bugs were fixed. 7-Zip could crash in some cases.
Internal changes in code.

Changes for v16.03 - v16.04

The bug was fixed: 7-Zip 16.03 exe installer under Vista didn't create
links in Start / Programs menu.
Some bugs were fixed in RAR code.

Changes for v16.02 - v16.03

- Installer and SFX modules now use some protection against DLL preloading attack.
- Some bugs were fixed in 7z, NSIS, SquashFS and RAR5 code.

Changes for v15.14 - v16.00

- 7-Zip now can extract multivolume ZIP archives (z01, z02, ... , zip).
- Some bugs were fixed.

Changes for v15.08 beta - v15.09 beta

7-Zip now can extract ext2 and multivolume VMDK images.
Some bugs were fixed.

Changes for v15.07 beta - v15.08 beta

7-Zip now can extract ext3 and ext4 (Linux file system) images.
Some bugs were fixed.

Changes for v15.06 beta - v15.07 beta

- 7-Zip now can extract GPT images and single file QCOW2, VMDK, VDI images.
- 7-Zip now can extract solid WIM archives with LZMS compression.
- Some bugs were fixed.

Changes for v15.03 alpha - v15.06 beta

7-Zip now can extract RAR5 archives.
7-Zip now doesn't sort files by type while adding to solid 7z archive.
new -mqs switch to sort files by type while adding to solid 7z archive.
The BUG in 7-Zip File Manager was fixed:
The "Move" operation to open 7z archive didn't delete empty files.
The BUG in 15.05 was fixed:
console version added some text to the end of stdout stream, is -so switch was used.
The BUG in 9.30 - 15.05 was fixed:
7-Zip could not open multivolume sfx RAR archive.
Some bugs were fixed.

Changes for v15.02 alpha - v15.03 alpha

7-Zip now can create 7z, xz and zip archives with 1536 MB dictionary for LZMA/LZMA2.
7-Zip File Manager now can operate with alternate file streams at NTFS
volumes via "File / Alternate Streams" menu command.
7-Zip now can extract .zipx (WinZip) archives that use xz compression.
new optional "section size" parameter for BCJ2 filter for compression ratio improving.
Example: -mf=BCJ2:d9M, if largest executable section in files is smaller than 9 MB.
Speed optimizations for BCJ2 filter and SHA-1 and SHA-256 calculation.
Console version now uses stderr stream for error messages.
Console version now shows names of processed files only in progress line by default.
new -bb[0-3] switch to set output log level. -bb1 shows names of processed files in log.
new -bs[o|e|p][0|1|2] switch to set stream for output messages;
o: output, e: error, p: progress line; 0: disable, 1: stdout, 2: stderr.
new -bt switch to show execution time statistics.
new -myx[0-9] switch to set level of file analysis.
new -mmtf- switch to set single thread mode for filters.
The BUG was fixed:
7-Zip didn't restore NTFS permissions for folders during extracting from WIM archives.
The BUG was fixed:
The command line version: if the command "rn" (Rename) was called with more
than one pair of paths, 7-Zip used only first rename pair.
The BUG was fixed:
7-Zip crashed for ZIP/LZMA/AES/AES-NI.
Some bugs were fixed.

Changes for v9.38 Beta - v15.01 alpha

7-Zip now can create 7z, xz and zip archives with 1536 MB dictionary for LZMA/LZMA2.
7-Zip File Manager now can operate with alternate file streams at NTFS
volumes via "File / Alternate Streams" menu command.
7-Zip now can extract .zipx (WinZip) archives that use xz compression.
new optional "section size" parameter for BCJ2 filter for compression ratio improving.
Example: -mf=BCJ2:d9M, if largest executable section in files is smaller than 9 MB.
Speed optimizations for BCJ2 filter and SHA-1 and SHA-256 calculation.
Console version now uses stderr stream for error messages.
Console version now shows names of processed files only in progress line by default.
new -bb[0-3] switch to set output log level. -bb1 shows names of processed files in log.
new -bs[o|e|p][0|1|2] switch to set stream for output messages;
o: output, e: error, p: progress line; 0: disable, 1: stdout, 2: stderr.
new -bt switch to show execution time statistics.
new -myx[0-9] switch to set level of file analysis.
new -mmtf- switch to set single thread mode for filters.
The BUG was fixed:
7-Zip didn't restore NTFS permissions for folders during extracting from WIM archives.
The BUG was fixed:
The command line version: if the command "rn" (Rename) was called with more
than one pair of paths, 7-Zip used only first rename pair.
The BUG was fixed:
7-Zip crashed for ZIP/LZMA/AES/AES-NI.
Some bugs were fixed.

Changes for v9.38 Beta - v15.00 alpha

This is a development version.
Don't use this alpha version to process important files and archives.
The code of this version contains big number of changes.
And probably there are some new BUGs.
7-Zip File Manager now can operate with alternate file streams at NTFS
volumes via "File / Alternate Streams" menu command.
7-Zip now can extract .zipx (WinZip) archives that use xz compression.
new optional "section size" parameter for BCJ2 filter for compression ratio improving.
Example: -mf=BCJ2:d9M, if largest executable section in files is smaller than 9 MB.
Speed optimizations for BCJ2 filter and SHA-1 and SHA-256 calculation.
Console version now uses stderr stream for error messages.
Console version now shows names of processed files only in progress line by default.
new -bb[0-3] switch to set output log level. -bb1 shows names of processed files in log.
new -bs[o|e|p][0|1|2] switch to set stream for output messages;
o: output, e: error, p: progress line; 0: disable, 1: stdout, 2: stderr.
new -bt switch to show execution time statistics.
new -myx[0-9] switch to set level of file analysis.
new -mmtf- switch to set single thread mode for filters.
The BUG was fixed:
7-Zip didn't restore NTFS permissions for folders during extracting from WIM archives.
The BUG was fixed:
The command line version: if the command "rn" (Rename) was called with more
than one pair of paths, 7-Zip used only first rename pair.
Some bugs were fixed.

Changes for v9.36 beta - v9.38 Beta

Some bugs were fixed.

Changes for v9.32 Alpha - v9.33 Alpha

7-Zip now can show icons for 7-Zip items in Explorer's context menu.
"Add to archive" dialog box:
new options in "Path Mode"
new option "Delete files after compression"
new "NTFS" options for WIM and TAR formats:
Store symbolic links
Store hard links
Store alternate data streams
Store file security
"Extract" dialog box:
new optional field to set output folder name
new option "Eliminate duplication of root folder"
new option "Absolute pathnames" in "Path Mode".
new option "Restore file security" (that works for WIM archives only)
7-Zip File Manager:
new "File / Link" dialog box in to create symbolic links and hard links.
Command line version:
new -spd switch to Disable wildcard matching for file names
new -spe switch to Eliminate duplication of root folder for extract archive command
new -snh switch to store hard links as links (WIM and TAR formats only)
new -snl switch to store symbolic links as links (WIM and TAR formats only)
NSIS support was improved.
The problem was fixed:
The command "extract to *" with multiple archives could use same
output folder, if archives are placed inside PE (EXE) file.
The BUG of 9.31-9.32 was fixed:
Command line version for test and extract commands returned the
value 0 as exit code, if it couldn't open archive.
The BUG was fixed:
7-Zip could not create archives with anti-items for any archive type,
except of 7z type
Some bugs were fixed.
New localization: Mongolian (script).

Changes for v9.22 beta - v9.32 Alpha

7-Zip now can create multivolume SFX archives in 7z format.
ZIP, NSIS, HFS, AR support was improved.
7-Zip now supports files larger than 4 GiB in ISO archives
Improved compression ratio in 7z format with maximum or ultra level for
executable files (EXE and DLL) that are larger than 16 MB (improved BCJ2 filter).
Improved support for file pathnames longer than 260 characters.
CRC and SHA checksum calculation for files can be called via Explorer's context menu.
7-Zip File Manager now also takes into account the numbers in filenames for sorting order.
7-Zip File Manager now can use RAM buffers instead of temp files to open
nested archives, if temp file is smaller than 1/4 of RAM size.
7-Zip File Manager can open files in "Parser" mode via "Open Archive > #" context
menu command. It shows the list of archives inside file.
Command line version:
new -t# switch to open file in "Parser" mode and show the list of archives inside file.
new -stx{Type} switch to exclude archive type from using.
-scs switch now supports UTF-16 encoding.
now it shows time and memory usage statistics at the end of execution.
The BUGs were fixed:
7-Zip 9.30 and early versions created ZIP archives with minor errors
in extra field of headers for directory items, if AES (WinZip-AES) encryption was used.
7-Zip could work incorrectly in decompression of more than one
multi-volume archive in one command.
7-Zip 9.24 alpha - 9.30 alpha versions could not extract ZIP archives
encrypted with PKWARE-AES method.
Minimum supported system now is Windows 2000. 7-Zip does not work on Windows 95/98/ME.
New localization: Irish.
Some BUGs of 7-Zip 9.31 alpha were fixed:
- 7-Zip could not unpack some RAR archives
- 7-Zip File Manager could work incorrectly for unpacking from solid archives,
if archive was open in 7-Zip File Manager. Also 7-Zip File Manager could leave
some unpacked files in TEMP folder of Windows.
So look your TEMP folder and remove folders that have "7z" prefix in name.

Changes for v9.21 Beta - v9.22 beta

7-Zip now uses progress indicator displayed on a taskbar button under Windows 7.
The BUG in 7-Zip 9.21 beta was fixed: 7-Zip could ignore some options when you created ZIP archives. For example, it could use ZipCrypto cipher instead of AES-256.

Changes for v9.20 - v9.21 Beta

- 7-Zip now can unpack UEFI BIOS files.
- 64-bit version of 7-Zip now includes additional 32-bit shell extension DLL. So other 32-bit programs can call 64-bit 7-Zip via context menu.
- Now it's possible to associate 7-Zip with file types without Administrator rights.
- New -mf=FilterID switch to specify compression filter. Examples:
7z a -mf=bcj2 a.7z a.tar
7z a -mf=delta:4 a.7z a.wav
7z a -mf=bcj a.tar.xz a.tar
- 32-bit 7-Zip running under 64-bit Windows x64 now can use up to 4 GB of RAM.
- Some bugs were fixed.
- New localizations: Corsican, Kyrgyz, Ligurian.

Changes for v9.19 Beta - v9.20

Some bugs were fixed.

Changes for v9.18 Beta - v9.19 Beta

The console version now doesn't show entered password.
Some bugs were fixed.

Changes for v9.17 Beta - v9.18 Beta

7-Zip now can unpack SquashFS and CramFS filesystem images.
7-Zip now can unpack some TAR and ISO archives with incorrect headers.
New small SFX module for installers (in Extra package).
Some bugs were fixed.

Changes for v9.16 Beta - v9.17 Beta

Disk fragmentation problem for ZIP archives created by 7-Zip was fixed.

Changes for v9.15 Beta - v9.16 Beta

7-Zip now supports files that are larger than 8 GB in TAR archives.
NSIS support was improved.
Some bugs were fixed.
New localizations: Hindi, Gujarati, Sanskrit.

Changes for v9.14 Beta - v9.15 Beta

Some bugs were fixed.
New localization: Tatar

Changes for v9.13 Beta - v9.14 Beta

WIM support was improved.

Changes for v9.12 Beta - v9.13 Beta

7-Zip now stores NTFS file timestamps to ZIP archives.
New additional "Open archive >" item in context menu allows to select archive type for some files.
Some bugs were fixed.
New localization: Uyghur.

Changes for v9.11 Beta - v9.12 Beta

ZIP / PPMd compression ratio was improved in Maximum and Ultra modes.
The BUG in 7-Zip 9.* beta was fixed: LZMA2 codec didn't work, if more than 10 threads were used (or more than 20 threads in some modes).

Changes for v9.09 Beta - v9.10 Beta

The BUG in 7-Zip 9.09 beta was fixed: 7-Zip created incorrect ZIP archives, if ZipCrypto encryption was used.

Changes for v9.07 Beta - v9.09 Beta

7-Zip now can unpack Apple Partition Map (APM) disk images.
Speed optimizations in AES code for Intel's 32nm CPUs.
Speed optimizations in CRC calculation code for Intel's Atom CPUs.
Some bugs were fixed.

Changes for v9.06 Beta - v9.07 Beta

It's possible to specify Diff program in options (7-Zip File Manager).
Some bugs were fixed.

Changes for v4.64 - v4.65

7-Zip File Manager now can calculate SHA-256 checksum.
Some bugs were fixed.

Changes for v4.63 - v4.64

The bug in 7-Zip 4.63 was fixed: 7-Zip could not decrypt .ZIP archives encrypted with WinZip-AES method.

Changes for v4.62 - v4.63

7-Zip now can unpack ZIP archives encrypted with PKWARE-AES.
Some bugs were fixed.

Changes for v4.61 Beta - v4.62

Some bugs were fixed.

Changes for v4.60 Beta - v4.61 Beta

7-Zip now supports LZMA compression for .ZIP archives.
Some bugs were fixed.
New localization: Sinhala.

Changes for v4.59 Beta - v4.60 Beta

Some bugs were fixed.

Changes for v4.58 Beta - v4.59 Beta

7-Zip now can unpack UDF, XAR and DMG/HFS archives.
7-Zip File Manager now keeps encryption when you edit encrypted file inside archive.
7-Zip File Manager now allows to change current folder from the address bar drop-down list.
It's allowed to use -t switch for "list" and "extract" commands.
Some bugs were fixed.
New localizations: Icelandic, Kurdish Sorani.

Changes for v4.57 - v4.58 Beta

Some speed optimizations.
7-Zip now can unpack .lzma archives.
Unicode (UTF-8) support for filenames in .ZIP archives. Now there are 3 modes:
Default mode: 7-Zip uses UTF-8, if the local code page doesn't contain required symbols.
-mcu switch: 7-Zip uses UTF-8, if there are non-ASCII symbols.
-mcl switch: 7-Zip uses local code page.
Now it's possible to store file creation time in 7z and ZIP archives (-mtc switch).
7-Zip now can unpack multivolume RAR archives created with "old style volume names" scheme and names *.001, *.002, ...
Now it's possible to use -mSW- and -mSW+ switches instead of -mSW=off and -mSW=on
Some bugs were fixed.
New localizations: Punjabi (Indian), Pashto.

Changes for v4.56 Beta - v4.57

The BUG in command line version was fixed: -up3 switch could work incorrectly.

Changes for v4.55 Beta - v4.56 Beta

Some bugs were fixed.

Changes for v4.53 Beta - v4.55 Beta

Some bugs were fixed.
Decompression speed was increased.

Changes for v4.52 Beta - v4.53 Beta

Interface improvements
Some bugs were fixed

Changes for v4.51 Beta - v4.52 Beta

7-Zip now can unpack Compound files (msi, doc, ...).
Some bugs were fixed.

Changes for v4.50 Beta - v4.51 Beta

Bug was fixed: 7-Zip 4.50 beta could not open some .7z archives.

Changes for v4.49 Beta - v4.50 Beta

New switch for command line version: -ssc[-] enables/disables case-sensitive mode for file names.
Speed optimizations for AES encryption.
Some bugs were fixed.

Changes for v4.48 Beta - v4.49 Beta