You can converted between TAR and TGZ archives using the ALZip software. Might be also possible with other programs that support at least one of the programs, but its better to use single program for the job.
Convert Unix standard Archive format, Tape Archive to Gzip compressed TAR archive.
We found 2 software records in the database related to .tar to .tgz file format conversion.
Microsoft Windows software - convert tar to tgz on Windows
One of the many available file compression utilities
Convert from tar file format
|Yes, ALZip supports tar file conversion as a source file type.||Yes||No||No||Yes||No||No||Yes|
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 tar to tgz. 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.
Linux/Unix software - convert tar to tgz on Linux
TAR file archiver for Unix