I built an offline-first Markdown editor that runs as a single HTML file

Source: Dev.to

Introduction

Most Markdown editors today assume cloud sync, Electron, or heavy installations. I wanted something simpler.

I wanted a Markdown editor that:

• Works fully offline
• Opens local .md files directly
• Saves back to the original file
• Requires no account, no sync, and no network calls

Demo Video

Watch the demo video on GitHub:

https://github.com/user-attachments/assets/00d80cbc-ca93-4cfd-86d3-5299895d06b7

Main Features

• Live preview while editing
• Folder tree support
• Dark / Light theme
• Local file editing and overwrite save
• Privacy‑focused design

The project, offline‑md‑editor‑viewer, runs as a single HTML file, which means it works on Windows, Linux, and macOS. A desktop version using Tauri is also available, but both versions share the same frontend.

GitHub:
https://github.com/ishizakahiroshi/offline-md-editor-viewer