Marph
2
If it's generic HTML, you could unzip and try:
- The builtin HTML import
File -> Import -> HTML
. I'm just not sure if the note is editable afterwards.
- Pandoc or jimmy (which is essentially a wrapper around Pandoc) to convert to Markdown and then import to Joplin.
If it's "custom" HTML, I think there isn't an import tool, yet. At least I didn't find anything on the wiki page: