Markdown Viewer

Render Markdown files as styled HTML with themes, syntax highlighting, TOC, Mermaid and KaTeX.

Markdown Viewer turns any .md or .markdown file in Chrome into a beautifully styled page. KEY FEATURES • 10 themes: Auto, GitHub Light, GitHub Dark, Sepia, Dracula, One Dark, Tokyo Night, Nord, Solarized Dark, Solarized Light • Live auto-reload while editing — the extension watches the file and re-renders on save (opt-in via Options) • Copy-code button on every fenced code block • Resizable, collapsible Table of Contents with active-heading tracking • Syntax highlighting for ~35 languages via highlight.js • Mermaid diagrams (flowchart, sequence, class, state, ER, gantt, pie, journey, git graph, mindmap, quadrant) • KaTeX math rendering (inline $…$ and display $$…$$) • Adjustable reading width (full, wide, normal, narrow) and font size • Toggle rendered / raw with one click • XSS-safe: all output sanitized with DOMPurify • Works on local files (file://) and remote raw-file URLs PRIVACY All rendering happens locally in your browser. No data is sent to any server. No analytics, no telemetry, no remote code. Auto-reload (when enabled) only reads your local file - nothing leaves your browser. Privacy policy: https://www.empiricapps.com/markdown-viewer-privacy OPEN SOURCE MIT-licensed. Source code, releases, and changelog: https://github.com/mburlac/empiric-apps-markdown-viewer-chrome RECENT CHANGES v0.4.1 (2026-05-27) - Fix: blank page on first .md file opened from a folder (added page-context fetch fallback for file:// when the service worker is cold-starting). v0.4.0 - 5 new themes (One Dark, Tokyo Night, Nord, Solarized Dark, Solarized Light), live auto-reload while editing, copy-code button on every fenced block, fix for non-English text in code blocks v0.3.2 - Robust raw-text retrieval; no more blank page on refresh after editing v0.3.1 - Fix for blank page on drag-drop / "Open with Chrome" first load v0.3.0 - Resizable TOC, burger menu toggle, full-width reading mode, fixes for tab title and Mermaid on local files v0.2.0 - Initial public release Built by Empiric Apps - https://empiricapps.com