It is possible to open a WEBARCHIVE file in Safari web browser and save the resulting file as complete HTML document.
Convert Apple Safari web archive to HyperText Markup Language web page.
We found 2 software records in the database related to .webarchive to .html file format conversion.
Microsoft Windows software - convert webarchive to html on Windows
An easy to use, multiplatform web browser developed by Apple
Convert from webarchive 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 webarchive to html. 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.
Apple macOS / Mac OS X software - convert webarchive to html on OS X
A default web browser integrated to Apple Mac OS X