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MarkdownViewer is a high-performance and cross-platform markdown viewer based on MewUI, built with .NET 10 and implemented in 100% C#, with support for Native AOT publishing.

Feature Highlights

• Real-time Markdown rendering: 50 ms debounce
• Supports supper long document
• Supports export files as .png, .pdf, .docx, .html, all codes in the control, no more third party library referenced
• Selectable preview: supports selection and copy via SelectableTextBlock
• Table rendering: supports GFM tables and column alignment (left/center/right)
• GitHub-style formatting: headings, bold, italic, strikethrough, code blocks, tables, task lists, blockquotes, indented code blocks, and more
• Cross-platform: Windows, Linux, macOS
• AOT publishing: can be compiled into a standalone executable with no .NET runtime required

Technical Implementation

• Graphics backend: using MewUI.Skia and interops with Direct2D/Gdi/MewVG
• Markdown parser: pure C# implementation with no external dependencies, optimized using ReadOnlySpan<char> and [MethodImpl(AggressiveInlining)]
• GFM support: tables, task lists - [ ] / - [x], fenced code blocks, inline code, links, images, and more
• Rendering control: custom MarkdownRenderer that transforms the AST into native MewUI controls

[!NOTE]

• Relies on the latest MewUI project since 2026/06/03.
• 😺 MewUI (https://github.com/aprillz/MewUI) is a cross-platform and lightweight, code-first .NET GUI framework aimed at NativeAOT.
• Thanks to LumNote (https://github.com/LdotJdot/LumNote) for the high-performance Avalonia.Net editor. This project ported many codes from LumNote.MarkdownEditor.

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Screenshots

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✨ Highlights

• 📦 NativeAOT + trimming first
• 🪶 Lightweight by design (small EXE, low memory footprint, fast first frame)
• 🧩 Support MewUI Fluent C# markup (no XAML)

🚀 Quickstart

• git clone https://github.com/aprillz/MewUI
• git clone https://github.com/shonescript/MarkdownViewer
• build and run MarkdownViewer.sln

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🧪 C# Markup at a Glance

• Sample source

   var window = new Window()
       .Title("Hello MarkdownViewer for MewUI")
       .Size(520, 360)
       .Padding(12)
       .Content(
           new StackPanel()
               .Spacing(8)
               .Children(
                   new MarkdownViewer()
                       .Text("# Markdown texts ...")
  
                   new Button()
                       .Content("Quit")
                       .OnClick(() => Application.Quit())
               )
       );
  
   Application.Run(window);