Sketch app supports several formats for export purposes, including the common JPEG format (.jpeg) and also some other graphics formats. You can use the program to export certain parts or elements of the drawings as normal pictures.
Convert Bohemian Coding Sketch drawing to JPEG bitmap image format.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert sketch to jpeg on OS X
A professional design tool for OS X
Convert from sketch file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.