GIMP graphics editor can exports its own GZ format to several other picture formats - including the JPEG/JPG.
Convert GIMP image file to JPEG bitmap image format.
We have found 3 software records in our database eligible for .gz to .jpeg file format conversion.
Microsoft Windows software - convert gz to jpeg on Windows
A free graphics and photo editor and authoring tool
Convert from gz file format
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 gz to jpeg. 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.
Apple macOS / Mac OS X software - convert gz to jpeg on OS X
Mac version of the popular graphics editor
Linux/Unix software - convert gz to jpeg on Linux
GNU Image Manipulation Program