markdown-os

md files directly in their browser without files leaving their machine. The platform emphasizes privacy and convenience, positioning itself as an improvement over standard IDE previews by offering enhanced visualization tools and interactive editing features tailored to developer workflows.

The tool supports editing and viewing Markdown files with features such as a WYSIWYG editor, automatic table of contents generation based on document headings, and a file tree sidebar for browsing entire directories. Users can open multiple files at once, search for files, and switch between up to 15 open tabs, streamlining navigation within large documentation projects. For task management, markdown-os provides interactive task lists with clickable checkboxes that allow users to check off items directly in the editor interface.

Visualization is a key focus, with live rendering of Mermaid diagrams, including flowcharts and sequence diagrams, enhanced by zoom and pan tools not typically available in basic IDE previews. Code blocks are supported with syntax highlighting for over 100 programming languages, each block featuring a copy button, language label, and optional line numbers. Users can also customize the editor's appearance with six built-in color themes, including options like Dracula, Nord Light, Nord Dark, and Lofi, which can be switched with a single click.

markdown-os can be accessed via a browser-based interface, and it is also available as a desktop application and through a CLI, with both the desktop app and CLI shipped from the same release tags. The tool is built for developers who require a robust, local-first Markdown editing environment with advanced visualization and organizational features.