What is md-viewer-app?

MD Viewer is a lightweight desktop application for reading Markdown files. Markdown is a simple text format used for documentation, notes, and READMEs, the kind of file you often see in GitHub repositories. MD Viewer is designed for when you just want to open a folder and read those files without the overhead of a full code editor. The app lets you open individual Markdown files by dragging and dropping them, or open an entire folder and browse its Markdown files using a sidebar file explorer. You can keep multiple documents open in tabs, each with its own theme. A document outline panel shows the headings of the current document so you can jump around quickly. It also has basic editing capabilities with preview, edit, and split-view modes, plus shortcuts for common formatting like lists, code blocks, and links. Additional features include rendering Mermaid diagrams (a text-based way to draw flowcharts and diagrams inside Markdown), exporting to HTML, DOCX, or PDF, copying rendered content, and switching the interface between Chinese and English. The app is built with Tauri (a framework for building desktop apps using web technology with a small footprint) and Vite, written in vanilla JavaScript. The Markdown rendering uses Markdown-it, and diagrams use Mermaid. This is a focused reading tool, not a replacement for a full code editor, useful when you want something that opens fast and stays out of your way.