Markdown Viewer

Markdown Viewer is a document formatting tool. A Chrome and Edge extension that turns local or web Markdown files into a searchable, annotatable workspace with document, mind map, and presentation views, plus export to HTML, Word, PDF, and PNG.

Markdown Viewer is a Chrome and Edge extension built for people who read, search, and annotate Markdown files regularly, whether those files live in local project folders, code repositories, or raw web URLs. Rather than pasting content into an online converter or opening a separate editor, the extension replaces the plain-text view of a .md file with a structured workspace: a folder tree for browsing related documents, a searchable heading outline, and rendering for tables, code blocks, math, callouts, and diagrams such as Mermaid, Graphviz, PlantUML, and Vega-Lite. The tool is aimed at technical writers, developers, and anyone who works with documentation, decision logs, or research notes in Markdown and wants more than a bare preview. Reading, annotation (highlights, underlines, comments linked to source passages), and folder-wide search all happen inside the browser, and the same document can be switched between a standard document view, a mind map built from its heading structure, or a full-screen presentation mode without altering the underlying file. In practice, a user installs the extension, grants it file URL access for local documents, then opens a folder or a single .md file to start browsing. Reading position, recent documents, and diagram renders are cached locally so returning to a file picks up where the reader left off. Finished documents can be exported as HTML, Word, PDF, full-document PNG, or (for mind maps) SVG, PNG, and JPEG. Against dedicated Markdown editors or cloud-based note apps, Markdown Viewer's distinguishing trait is that it works directly on existing files without requiring an account, upload, or migration of content into a new system. All processing, annotation history, and caching stay on the device, which positions it closer to a reading and reference tool than a collaborative editor.