MDView - Markdown Viewer

Beautiful markdown file viewer with themes, syntax highlighting, and interactive Mermaid diagrams

Transform your local Markdown files into beautifully rendered documents with MDView, a feature-rich Chrome extension designed for developers, writers, and documentation enthusiasts. KEY FEATURES 8 Beautiful Themes Choose from GitHub Light/Dark, Catppuccin (Latte, Frappé, Macchiato, Mocha), Monokai, and Monokai Pro. Auto dark mode automatically switches themes based on your system preference. Syntax Highlighting Support for 195+ programming languages with professional highlighting themes. One-click copy buttons on all code blocks for quick reference. Interactive Mermaid Diagrams View flowcharts, sequence diagrams, class diagrams, and more with full interactivity: • Zoom and pan with mouse or keyboard • Maximize diagrams to full screen • Export diagrams as SVG files • Smooth animations and transitions Fast Performance Progressive hydration renders large files instantly with skeleton UI while content loads in the background. Web workers handle heavy processing to keep the UI responsive. Enhanced Markdown Support Full CommonMark and GitHub Flavored Markdown support including: • Task lists with checkboxes • Tables with alignment • Footnotes and anchors • Emoji shortcodes • Automatic heading links • Custom attributes Smart File Watching Automatically detects when Markdown files change on disk and refreshes the view. Perfect for live preview while editing. Customizable Settings • Adjustable font family, size, and line height • Maximum content width control • Line numbers for code blocks • Custom zoom levels for diagrams • Cache management options Privacy & Security • No external network calls • DOMPurify sanitization for safe content • Minimal permissions required • All processing happens locally PERFECT FOR • Software developers viewing README files • Technical writers previewing documentation • Students reading course materials • Researchers organizing notes • Anyone working with Markdown files REQUIREMENTS After installation, you must enable "Allow access to file URLs" in chrome://extensions/ to view local files. Open source and MIT licensed. View the source code at github.com/jamesainslie/mdview