XnView Software

Apologies: original post text asking the above question inadvertently overwritten due to a moderator procedural error, possible aftereffect of a general anaesthetic three days ago? cday

A quick online search for 'convert html file to jpeg' brings up quite a number of online converters you might look at...

In suitable rather limited circumstances another possibility could be to make a screenshot or series of screenshots and then process the resulting images in XnView MP.

Another possibility, depending on the nature and quantity of HTML files to be saved, could be to paste the required text or images into a word processor, make any edits needed and then export the resulting files to JPEG format: LibreOffice Writer (and Draw) support that, as likely do the MS Office equivalents.

I have sometimes used the above workarounds to save particular parts of small HTML files as image or PDF files.

I think it is unlikely that Pierre would add general support anytime soon given his workload and current priorities.