PeaZip offers full read /
write support (compressor, and extractor / opener) for 7Z archives and
through the Open Source components from 7-Zip and p7zip projects
under LGPL license, as PeaZip) to offer the same GUI
browse, and extract 7Z archives under Windows
and Linux operating systems.
The software can also manage password protected 7z archives (encrypt
decrypt), and convert files to / from 7z format.
7Z format provides high
compression ratio using by default LZMA2
compression algorithm - optionally LZMA, PPMd, BZIP2 and Deflate are
available as alternative compression algorithms - and built in strong
compression based on AES256.
Read also: what is .7z file format
As alternative utilities,
7-Zip (on MS Windows systems) and p7zip (on
both free and Open Source tools, are recommended for working with 7z
Compress to 7Z format
Use one of the
following procedures to add
folders to a new archive (single or separate - one for each input item)
into an existing .7z file
archive creation interface it is possible to apply AES256 encryption (recipient will
to enter a password to read/extract the archive), and to split file - set creation
of multiple volumes declaring
the maximum output size
(spanned archive), in order to keep the output size
below mandatory limits (e.g. upload or mail attachment size).
Compress to 7z from system file explorer
Select files and folders and use
entry PeaZip, Add to archive: you will be prompted to archive creation
screen, allowing to set compression settings, output destination,
encryption (password protection), and other options.
From "Advanced" tab, you can
fine-tune compression settings: faster or higher compression level,
algorithm, solid compression
block size, compress open files, create self-extracting archive (SFX)
will not need an archive
program to extract the data...
From "Console" and "Schedule" tab, the compression / backup task
created in the GUI can be saved as command line script and (on Microsoft
operating system) scheduled for execution at fixed time intervals
(hour, day of the week or of the month) - same apply for extraction /
restore tasks, as the same tabs are featured in archive extraction
Update existing 7Z archive
To update existing 7z
adding files and folders, proceed as shown above for archive creation,
but select an existing
archive as output and chose add (always
replace files in archive) or update (overwrite
only older files in archive) "archive function" in
Easiest way to edit an existing archive is opening it in PeaZip and
dragging files/folders to it, which will automatically activate update
mode - can be changed into add mode in advanced tab.
To remove (delete) data from
7z archive, select items and press cancel or "Delete from archive"
button. Deleted items will not be recoverable from recycle bin.
Entries in the context menu on the right of delete button allows to
delete the entire archive in different supported ways (recycle, quick
delete, overwrite with zeroes, secure
delete shredding data to make the archive not recoverable)
How to convert
archive to 7Z format and vice versa is possible using the
integrated file converter
procedure, clicking Convert button,
which extracts and then re-pack input archive files, optionally keeping
or deleting original
More generally this utility makes possible to convert any type
supported for reading (e.g. 7Z, ACE, ARC, CAB, PEA, RAR, TAR, ZIP,
ZIPX...), even mixed extensions at once, into any write-supported
format (7Z, ARC, PEA, TAR, ZIP...), either converting each single input
archive to a single output archive, or consolidating all input files
into a single output archive in the new format.
Open and extract 7Z file
one of the procedures described below to
(browse and search
inside the archive) and/or decompress
.7Z archives or .XZ files, using PeaZip as opener / extractor
extract a spanned (split) 7Z file, save all the parts in the same
directory, then open as usual the first volume of the archive, which
has .7Z.001 extension - subsequent volumes have
progressively numbered file extensions (002, 003 etc).
Manage encrypted 7Z archives (AES256)
To create, or extract, an encrypted
.7z file, enter
the password in PeaZip clicking the padlock icon in the status bar
(in the file/archive browser) or below output address
field (in extraction or archiving interfaces), or click Tools >
password / keyfile in main menu, or press F9 accelerator key.
In encrypted 7z archives
(AES256 algorithm) password protected items inside the archive are
marked by * sign after
Please note 7z
supports file-level encryption so multiple passwords can be used in the
same archive to encrypt different group of files - and consequently in
this case different password must be provided to access each part of
the archive, changing password entered in PeaZip.
"Keyfile" field is optional, leave it blank if you don't want to rely
factor authentication - keyfile is the "what you have" element (needs
to be handled safely), password (or passphrase) is the
non-material "what you know" element; both are needed for
recovering the encrypted file content.
Use of keyfile increases security over password
only encryption since also having access to the keyfile will be
required to perform the extraction, eliminating the need of overly
complex passwords to resist to social engineering profiling, and
brute-forcing or dictionary attacks.