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            <h1 style="text-align: center;"><big><big><big><a
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            <h2><big><big><big><a style="font-weight: bold;"
 name="7z_files"></a><a href="#7zip_file_format"><span
 style="font-weight: bold;">7Z file type: 7-Zip archive format</span><br>
            </a></big></big></big></h2>
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            <div style="text-align: left;"> </div>
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            <br>
            <br>
            <h2 style="font-weight: bold;"><big><big><small>What is a
.7z file</small><br>
            </big></big></h2>
            <br>
            <a name="what_is_7z_format"></a>7Z extension designates a
popular archiving format, created for
7-Zip, a
modern file archiver application written by Igor
Pavlov and released as freeware and Open Source software. 7-Zip
(often incorrectly shortened in 7zip) was originally developed for
Microsoft Windows platforms, and ported by p7zip (POSIX-7Zip) project
team on
Unix platforms.<br>
Spanned multi-volume 7z archives are designated by .001 extension,
incrementing file extension numerator for each successive volume of the
set - spanned 7z files are split byte-wise, this raw splitting
mechanism being compatible with Unix / Linux "split" command and
Windows utilities like HJSplit.<br>
            <br>
            <br>
            <h3><big><span style="font-weight: bold;">PeaZip support
for .7z file type</span><br>
            </big></h3>
            <br>
PeaZip supports <a href="7zip-files-utility.html">creation and
extraction of 7z files</a>: create, open, browse, and extract 7Z
archives, convert any supported archive to 7z format and vice-versa.<br>
            <h2><img title="What is 7Z format compression"
 alt="what are 7z files" src="add-to-archive.png"
 style="width: 100px; height: 45px;"></h2>
            <h3><img title="What is a 7z file and how to extract"
 alt="what are 7z archives" src="extract-archive.png"
 style="width: 112px; height: 45px;"></h3>
            <br>
            <br>
            <h2 style="font-weight: bold;"><big>Maximum number of
files in a 7z archive</big></h2>
            <br>
            <a name="max_file_number_for_a_7z_archive"></a>As <a
 href="rar-zip-file-format-size-limitations.html">maximum
number of input files per archive</a>, 7z format allows to store
up to 2^32 files (unsigned dword, 4 giga files), exceeding current
practical limits.<br>
            <br>
            <br>
            <h2><big><span style="font-weight: bold;">Maximum size of
each file in a 7z archive</span></big></h2>
            <br>
            <a name="max_input_file_size_for_7z_format"></a>7z
format can accept input files up to 2^64 bytes in size (16 exabytes,
each), far exceeding current needs and limits of most current
filesystem implementations.<br>
            <br>
            <br>
            <h2 style="font-weight: bold;"><big>Maximum total size of
7z archive</big></h2>
            <br>
            <a name="max_size_of_7z_files"></a>7z file can
theoretical be up to 2^64 bytes in size (16 exabytes of
total size of the archive), far exceeding current needs and
capabilities of filesystems as currently implemented.<br>
            <a name="maximum_size_limit_for_7z_format"></a>In
example <br>
            <ul>
              <li><span style="font-weight: bold;">FAT32 </span>filesystem
allows files up to 2^32 bytes (4GB in size)</li>
              <li><span style="font-weight: bold;">NTFS </span>filesystem
allows max file size of 2^64 bytes (16 EB) but implementations allows
lower maximum sizes, 16 TB in Windows 7, 256 TB in Windows 8, 8 PB in
Windows 10</li>
              <li><span style="font-weight: bold;">exFAT</span>
filesystem theoretically allows 2^64 bytes max file size (16 EB), but
current implementation is limited to 128 PB</li>
            </ul>
            <br>
            <h2 style="font-weight: bold;"><big>Features of .7z file
format<br>
            </big></h2>
            <br>
            <a name="7z_file_format"></a>7Z features very high
compression ratio through powerful
compression
algorithms (LZMA, LZMA2, PPMd, BZip2, optionally optimized
Deflate), at
cost of more
memory and CPU
intensive compression process
- that however can take benefit
of
parallel computing on modern multicore CPUs.<br>
With Tino
Reichardt's codecs for <a href="brotli-compressed-file-format.html">Brotli</a>,
Lizard, LZ4, LZ5, and <a href="zst-compressed-file-format.html">Zstd</a>
algorithms,
supported by PeaZip, 7z format features faster-than-zip compression /
extraction.<br>
On average test cases 7Z
format improves compression ratio 30-70% better over classic <a
 href="zip-file-format.html"><span style="font-weight: bold;">ZIP</span>
format</a>, and 6-7% better than <a href="what-is-rar-file.html"><span
 style="font-weight: bold;">RAR</span> file format</a> (WinRar's
native format, proprietary); 7Z compression compares favourably also
with new <span style="font-weight: bold;">WinZip's <a
 href="zipx-file-format.html">ZIPX</a></span><a
 href="zipx-file-format.html"> format</a>
in most cases.<br>
7Z format also features native UTF-8 support for filenames,
Rijndael / AES
encryption, and volume spanning.<br>
            <br>
            <span style="font-weight: bold;">XZ file extension</span><br>
            <a name="xz_lzma_compression"></a><span
 style="font-weight: bold;">XZ </span>extension
identify a
pure compression
format (compresses a single file, without offering option of archiving
multiple input file into a single output .xz file), it is based on
LZMA/LZMA2 algorithm
family, featuring usual 7z-like compression ratio (similar or
higher compared to RAR), recently often used on <a
 href="tar-file-format.html"><span style="font-weight: bold;">TAR</span></a>
files.<br>
            <br>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; text-align: right; width: 128px;">
                  <h2><span style="font-weight: bold;"><img
 title="What are 7Z format features and specifications"
 alt="7z format features" src="file-format/quotes.png"
 style="width: 32px; height: 32px;"></span></h2>
                  </td>
                  <td style="vertical-align: top; font-style: italic;">
                  <h3><span style="font-weight: bold;">When is 7Z
format
recommended</span></h3>
.7z format is recommended anytime
it is important to attain a superior compression ratio, and it is
welcome the support for strong encyption to keep archived data private.<br>
It is recommended over zip format when enough time for compression or
backup is available, in order to provide better reduction of output
size.<br>
PeaZip also supports creation of 7z-format <a
 href="self-extracting-archives.html">self extracting archives</a> (<span
 style="font-weight: bold;">SFX</span>), so recipient will not need a
7-Zip compatible extractor when receiving one of those self-extracting
files.</td>
                  <td style="vertical-align: bottom; width: 128px;">
                  <h3><img
 title="What is 7z file format, native 7-Zip archives extension"
 alt="7z format specifications" src="file-format/quotes-inverse.png"
 style="width: 32px; height: 32px;"></h3>
                  </td>
                </tr>
              </tbody>
            </table>
            <br>
            <a name="7z_format_specs"></a>Read more about .7z
extension: <a target="_blank" href="http://www.7zip.org/">7-Zip
official domain<img title="7-Zip archival utility"
 alt="7zip software domain" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="http://p7zip.sourceforge.net/">p7zip project<img
 title="posix 7-zip" alt="p7zip" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> POSIX
port
of 7-Zip for Unix and Unix-like operating systems, <a target="_blank"
 href="http://www.7-zip.org/7z.html">7Z file
format
specifications<img alt="7zip specifications" title=".7Z file format"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="http://en.wikipedia.org/wiki/7z">7Z format
Wikipedia entry<img title="Wikipedia 7Z file type"
 alt="7zip archive format" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px; font-weight: bold;"></a>,
            <a target="_blank"
 href="http://en.wikipedia.org/wiki/Prediction_by_partial_matching">PPMd<img
 title="PPM algorithm" alt="Wikipedia prediction by partial matching"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> and <a
 target="_blank"
 href="http://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm">LZMA
/ LZMA2<img alt="Lempel Ziv Markov chain algorithm"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> data
compression algorithms.<br>
            <br>
            <table
 style="background-color: rgb(72, 136, 248); width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="1">
              <tbody>
                <tr style="color: rgb(245, 245, 245);">
                  <td colspan="1" rowspan="1"
 style="vertical-align: top; background-color: rgb(72, 136, 248);">
                  <table style="width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="0">
                    <tbody>
                      <tr>
                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <table style="width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="0">
                          <tbody>
                            <tr>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">
                              <h3><big><big><big><big><big><a
 name="7z_file_extension"></a>.7Z</big></big></big></big></big></h3>
                              </td>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">Author
Igor
Pavlov, 1999<br>
2^32 max number of files<br>
2^64 bytes max size (archive, files)<br>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>7Z SPEED <img
 alt="7z archives specifications"
 title="7z compression / extraction speed" src="zip-files/star3.png"
 style="width: 80px; height: 16px;"></big></h4>
7z format features average speed, computing intensive compression
algorithms are balanced by
efficient parallel programming implementation. With codecs providing
Brotli, Lizard,
LZ4, LZ5, and Zstd methods, speed is excellent, faster than Deflate. </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>7Z COMPRESSION
RATIO <img alt="what are 7z features"
 title="7z compression performances" src="zip-files/star4p5.png"
 style="width: 80px; height: 16px;"></big></h4>
7z archives feature very good compression ratio. Comparable, often
better than WinRar's RAR compression, but
inferior
to state of art PAQ compressor, if enough time is available it is
recommended for sparing more disk space as possible when executing
backup, compressing disk images or large quantities of data.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;"><big>7Z
ADVANCED
OPTIONS <img alt="7z specs" title="7z format options"
 src="zip-files/star4.png" style="width: 80px; height: 16px;"></big><br>
7z format features a good array of advanced options. Native support for
AES encryption and UTF-8 encoding. Lacks
recovery records option
available for RAR format.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                    </tbody>
                  </table>
                  </td>
                </tr>
              </tbody>
            </table>
            <br>
            <p><span style="font-weight: bold;">Synopsis: 7Z file
extension. What is 7Z file format, native 7-Zip archives type
extension. What are XZ, LZMA, 7z files features and specifications,
maximum size, max number of files limit. 7Z format superior compression
ratio, compression speed, aes encryption
and advanced format options. What is 7z archive format recommended for.<br>
            </span></p>
            <p><span style="font-weight: bold;">Topics: 7z file
extension specs<br>
            </span></p>
            <p><span style="font-weight: bold;">PeaZip &gt; FAQ &gt; 7Z
file extension, 7-Zip archive format<br>
            </span></p>
            <table
 style="background-color: rgb(240, 240, 240); width: 100%; text-align: left;"
 border="0" cellpadding="24" cellspacing="1">
              <tbody>
                <tr>
                  <td colspan="1" rowspan="1"
 style="vertical-align: top; background-color: rgb(250, 250, 250);">
                  <h3><img
 title="FAQ supported archive format features 7Z, RAR, TAR, ZIP..."
 alt="7z archive extension" src="file-format/file-format.png"
 style="width: 96px; height: 96px;" align="right"><a
 name="file_extensions"></a>SUPPORTED ARCHIVE FORMATS </h3>
                  <p><a style="font-weight: bold;"
 href="7z-file-format.html">7Z file extension (7-Zip archive format)</a><br>
                  </p>
                  <p style="font-weight: bold;"><a
 href="brotli-compressed-file-format.html">BR file extension
(Google Brotli compressed format)</a></p>
                  <p><a href="bzip2-file.html"><span
 style="font-weight: bold;">BZ2 extension, BZip2 compressed file format</span></a><br>
                  </p>
                  <p><a href="gzip-files.html"><span
 style="font-weight: bold;">GZ extension, Gzip compressed file format</span></a><br>
                  </p>
                  <p><a href="paq-file-format.html"><span
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