Convert GZ to JPEG

GNU zip's (.gzip) default compression algorithm is used to create .gz archive files. While they may also store several multiple compressed files, they usually contain one single compressed file.

You can use, for instance, GIMP (a cross-platform image editor) to export its own .gz format to various other image file types, such as .jpg/.jpeg.

Alternatively, you may try some of the online conversion tools, such as ASPOSE, GROUPDOCS or SENDEYO.