You can easily convert HTML files using MacUncle HTML Converter. The tool supports Mac OS Machines.
Start MacUncle HTML Converter on your Mac Computer.
Add HTML file using Add File(s) or Add Folder(s).
Select any file from the list, as shown here.
Choose a saving format from PST, EML, EMLX, MSG, MHT, PDF, DOC, DOCX, and TXT.
Browse for a location to save the converted HTML files.
Press the Export button to start the HTML file conversion.