If you want to convert compressed archive from one to another, let's say from 7-zip to Unix TAR, the best course of action is to decompress the first archive and then compress it again to different format. Good file archives support many different format, which should make the job very easy.
Convert 7-ZIP compressed 7z archive to Unix standard Archive format, Tape Archive.
We have found 5 software records in our database eligible for .7z to .tar file format conversion.
Microsoft Windows software - convert 7z to tar on Windows
A free file archiver developed by Igor Pavlov featuring higher compression ratios with LZMA and LZMA2 compression.
It is mainly available for Windows platform (for Mac and Linux are available command line tools) and is the primary program to handle 7z archives. However, also supports various compression file formats.
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z
Convert from 7z file
to tar file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 7z to tar. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
ALZip is compression utility that supports about 40 archive file formats. ALzip can open ALZ, ACE, EGG, RAR, ZIP etc.. Also can open disk images, such as ISO and BIN, LCD. ALZip is able to recovery passwords in protected ZIP archives.
Apple macOS / Mac OS X software - convert 7z to tar on OS X
Ez7z for Mac OS X is compression utility that is able to expand 7z, bzip2, gz, rar, tar and zip archives. Ez7z also supports shrink data into 7z, zip, gz, tar and bzip2 archive formats.
sArchiver is compression utility that supports variety of compression formats. sArchive can create and extract RAR, ZIP, 7z, ARJ, LHA, Gzip, BZip2 and TAR archives. Also can convert between them.
StuffIt for Mac is archive utility that is able to create ZIP and SITX archives as well as extract 25 different formats including StuffIt, Zip, RAR and Tar.