WinMD toevi

markdown markdown-editor markdown-viewer text-editor winui winui3

Use this command to install WinMD:

winget install --id=toevi.WinMD -e

WinMD is a lightweight Markdown editor and viewer for Windows built with WinUI 3 and Windows App SDK. It features a live HTML preview rendered by Markdig with a GitHub-style stylesheet (light and dark theme), a formatting toolbar, PDF export via WebView2, find/replace in both the editor and the rendered preview, undo/redo with keystroke coalescing, and .md file association for opening files from Explorer.

WinMD

A lightweight Markdown editor and viewer for Windows — no MSIX, no Store, just a plain .exe.

Features

Editor with a formatting toolbar (bold, italic, headings, lists, links, code)
Live preview rendered by Markdig with a GitHub-style stylesheet (light / dark theme)
PDF export via WebView2
Find / Replace in the editor; find in the rendered preview (injected JS)
Undo / Redo with keystroke coalescing (600 ms debounce groups a typing burst into one history step)
File association — open .md files by double-clicking in Explorer
Keyboard shortcuts: Ctrl+N/O/S, Ctrl+P (PDF), Ctrl+B/I, Ctrl+E (toggle editor/preview), Ctrl+F/H, F3/Shift+F3, F1 (help)

Requirements

Windows 10 version 1903 (19041) or later — x64 or ARM64
Windows App SDK 1.8 — the installer downloads it automatically if missing

Installation

Download WinMD-Setup.exe from the latest release and run it.

Building from source

Prerequisites: .NET 10 SDK with the Windows workload.

dotnet build -c Debug -t:Run -f net10.0-windows10.0.19041.0

See CONTRIBUTING.md for the full guide (project layout, conventions, building an installer).

Architecture

WinUI 3 app (Windows App SDK 1.8), unpackaged .exe, MVVM pattern.

Layer	Description
`MainWindow.xaml`	Main window — toolbar and editor/preview panel
`HelpWindow.xaml`	Help window with keyboard shortcut reference
`ViewModels/EditorViewModel.cs`	Single ViewModel — all application state
`Services/MarkdownService.cs`	Markdown → HTML conversion (Markdig + CSS template)
`Platforms/Windows/WindowsFileService.cs`	WinRT pickers + System.IO
`Platforms/Windows/WindowsPdfExporter.cs`	PDF export via WebView2
`Models/MarkdownDocument.cs`	Document data carrier
`Platforms/Windows/FileAssociation.cs`	`.md` file association registered in HKCU

Tech stack

Windows App SDK 1.8 — WinUI 3, WebView2
CommunityToolkit.Mvvm 8.4 — ObservableObject, RelayCommand
Markdig 1.3 — Markdown parser

License

MIT