Markside — Markdown Viewer and Editor

Render and edit Markdown in your browser. Fast. Private. Delightful. File tree, outline, quick switcher, syntax highlight, Mermaid.

Your browser shows local .md files as raw text. Markside fixes that. Drag any .md file into Chrome and Markside renders it beautifully. Instant. Private. Free. No account. No server. Want to make some edits? Toggle to raw mode, edit in place, and Markside saves to disk automatically. ──────────────────────── MADE FOR AI CODING FLOW ──────────────────────── Your coding agent just wrote a plan, spec, or README. You want to review it rendered — without opening VS Code, switching to Obsidian, or spinning up Grip. Markside sits in your browser, right where you already are. ▸ Drag any .md file into Chrome — renders instantly ▸ Or ask your agent: "open this in Chrome" — same result ▸ Edit with Ctrl+E, changes auto-save to disk ▸ No app switch. No context break. Stay in flow. ──────────────────── FEATURES ──────────────────── ▸ Full Markdown rendering — headings, tables, task lists, footnotes, wikilinks ▸ Syntax-highlighted code blocks with one-click copy (all major languages) ▸ Mermaid diagrams rendered inline — flowcharts, sequence diagrams, and more ▸ File tree sidebar — open any local folder, reopens automatically next time ▸ Document outline — auto-generated from headings, click to jump ▸ Quick switcher (Cmd+P) — fuzzy search across your entire folder ▸ Built-in editor (Ctrl+E) — CodeMirror 6, auto-saves to disk ▸ YAML frontmatter as a clean summary table ▸ Dark mode, follows system preference ──────────────────── WHY NOT THE ALTERNATIVES ──────────────────── VS Code / IDEs — built for writing code, not reviewing docs. Pulls you back into editor mode. Typora, Obsidian — another app to install and manage. Another window to switch back to. Glow — terminal navigation is high learning curve, and editing still means switching to vi. Grip — spins up a local server and sends your files to the GitHub API. Requires credentials. Markside — already in your browser. Lightweight. Private. Zero setup after install. ──────────────────── PRIVACY ──────────────────── No account. No server. No network requests — ever. Your files stay on your machine. ──────────────────── SETUP ──────────────────── 1. Install Markside extension 2. Go to chrome://extensions → Markside → Details → enable "Allow access to file URLs" 3. Drag any .md file into Chrome ──────────────────── COMPATIBILITY ──────────────────── Works in Chrome and Chromium-based browsers (Edge, Brave, Arc). Markside only activates on local file:// URLs. It does not communicate with any remote server. It does not affect Markdown hosted on GitHub, GitLab, Notion, or any website — those render Markdown natively and Markside stays out of the way.