➡Japanese 🇯🇵 日本語はこちら.

mdpad

A GitHub-flavored Markdown editor built as a Windows standalone desktop application.
Edit, preview, and diff your Markdown files with a clean, multi-pane interface.

Features

• Multi-pane layout -- switch between Editor, Preview, and Diff views (1-3 panes)
• GitHub-flavored Markdown -- full GFM rendering with task lists and footnotes
• Mermaid diagrams -- render flowcharts, sequence diagrams, and more
• KaTeX math -- inline and display math expressions
• Syntax-highlighted code blocks -- powered by highlight.js
• Search and replace -- in-editor find with match count display
• Global search -- cross-pane search across editor and preview
• Drag-and-drop -- open files by dropping them onto the window
• Autosave backup -- configurable timer with countdown display in status bar
• Crash recovery -- restore your work after unexpected exits
• HTML dialogs -- custom close and save confirmation dialogs with resume support
• Zoom control -- zoom in/out with level displayed in status bar
• Internationalization -- English and Japanese (en/ja)

Installation

Portable (recommended)

1. Download the latest .zip from Releases.
2. Extract to any folder.
3. Run mdpad.exe.

No installation required.

Build from source

See the Development section below.

Keyboard Shortcuts

Shortcut	Action
Ctrl+N	New file
Ctrl+O	Open file
Ctrl+S	Save
Ctrl+Shift+S	Save As
Ctrl+F	Find
Ctrl+H	Replace
Ctrl+1 / Ctrl+2 / Ctrl+3	Toggle panes
Alt+Z	Word wrap
Ctrl+Z	Undo
Ctrl+Y	Redo
Ctrl++ / Ctrl+-	Zoom in / out
Ctrl+0	Reset zoom
F12	DevTools

Development

Prerequisites

• Node.js (v18 or later)
• npm

Setup

git clone https://github.com/pumpCurry/mdpad.git
cd mdpad
npm install

Run

npm start

For development mode with DevTools:

npm run dev

Build

Build a portable directory:

npm run build

Build and create a zip archive:

npm run build:zip

Tech Stack

Component	Library	License
Application framework	Electron	MIT
Code editor	CodeMirror 6	MIT
Markdown parser	markdown-it	MIT
Diagrams	Mermaid	MIT
Math rendering	KaTeX	MIT
Syntax highlighting	highlight.js	BSD-3-Clause
Diff engine	jsdiff	BSD-3-Clause
HTML sanitizer	DOMPurify	Apache-2.0 / MPL-2.0
Markdown styles	github-markdown-css	MIT
Bundler	esbuild	MIT
Packager	electron-builder	MIT

Third-party Licenses

This project uses the following open-source libraries:

• Electron -- MIT License
• CodeMirror 6 -- MIT License
• markdown-it -- MIT License
• Mermaid -- MIT License
• KaTeX -- MIT License
• highlight.js -- BSD-3-Clause License
• jsdiff -- BSD-3-Clause License
• DOMPurify -- Apache-2.0 / MPL-2.0 License
• github-markdown-css -- MIT License
• esbuild -- MIT License
• electron-builder -- MIT License

Documentation

• User Guide
• Update History

License

MIT License. See LICENSE for details.

(C) pumpCurry, 5r4ce2