GIMP graphics editor saves images to its own XCF format. As such, your best bet is to download GIMP (its free) and re-save your *.xcf file as *.jpg. Perhaps some graphics converters may also support XCF format and are capable of the same conversion.
Convert GIMP XCF bitmap image to JPEG bitmap image format.
We found 4 software records in the database related to .xcf to .jpg file format conversion.
Microsoft Windows software - convert xcf to jpg on Windows
A dedicated conversion software
Convert from xcf 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 xcf to jpg. 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.
A free graphics and photo editor and authoring tool
Apple macOS / Mac OS X software - convert xcf to jpg on OS X
Mac version of the popular graphics editor
Linux/Unix software - convert xcf to jpg on Linux
GNU Image Manipulation Program