Markdown Viewer

Offline Markdown viewer with Mermaid, syntax highlight, TOC, dark mode & export.

Markdown Viewer renders .md and .markdown files directly in Chrome — no external services, no internet required. FEATURES - Renders GitHub-Flavored Markdown (GFM): headings, tables, task lists, strikethrough - Mermaid diagram support (flowcharts, sequence diagrams, ERDs) - Syntax highlighting for 190+ programming languages - Auto-generated Table of Contents sidebar - Dark / Light mode with persistent preference - Export to HTML or PDF (via print) - Full-width layout optimized for technical documents - Beautiful typography: Inter (English) + Noto Sans JP (日本語) SUPPORTED SOURCES - Local files (file://) — drag & drop .md files into Chrome - Remote URLs — GitHub Raw, GitLab, Bitbucket Server/Cloud - Auto-converts browse URLs to raw content (GitHub blob, Bitbucket browse, GitLab blob) - Works on corporate intranet and air-gapped environments HOW TO USE 1. Open any .md or .markdown file in Chrome — it renders automatically 2. Or click the extension icon on any page to open it in the viewer 3. Use the toolbar to toggle dark mode, export HTML, export PDF, or reload PERMISSIONS USED - webNavigation, tabs: to detect and redirect .md file navigation - storage: to save your dark/light mode preference - host_permissions (file://, http://, https://): to fetch and render markdown content from any source No data is collected. No external tracking. Fully offline after install. Built for engineers and technical teams working with Japanese and English documentation.