アドリオ/Adrio

This is a web editor created primarily for writing TRPG scenarios that does not communicate externally.
It reads folders stored on your PC and allows you to edit them on the web. (Uses File System Access API)
It's basically a Markdown editor with some extra features, but you can choose between two editing modes: MD + Preview dual-pane editing and rich text editing like Word or Google Docs, with seamless mode switching.

In addition to image importing, it supports LaTeX notation, code block display, and internal links (like [[this]]).
You can export specific files or all designated files with switchable order to PDF. It can also read fonts stored on your PC. (Uses Local Font Access API)

You'll start by selecting a folder to work in. Since you need to read and edit existing .md files, please create an empty file first.
※ Since this uses File System Access API and Local Font Access API, the recommended browsers are Chrome / Edge.