There are programs like Total HTML Converter which are dedicated to various HTML conversions and can export it to JPEG just fine. Even in batches.
Convert HTML Hypertext Markup Language web page to JPEG bitmap image format.
We have found 5 software records in our database eligible for .htm to .jpeg file format conversion.
Microsoft Windows software - convert htm to jpeg on Windows
Simple HTML to other format converter
Convert from htm 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 htm 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.
Professional desktop document publishing software from Adobe
Apple macOS / Mac OS X software - convert htm to jpeg on OS X
Mac version od Adobe's popular document designing and publishing software
Linux/Unix software - convert htm to jpeg on Linux
A HTML to image converter
On-line services software - convert htm to jpeg on web
An online text to image conversion service