Markside — Review, Edit, and Share Markdown

Collaborate on Markdown with agents and teammates: quick edits, inline comments, and shareable reviews. Fast, free, and local-first.

Review beautifully rendered local Markdown files. Make quick direct edits without chat. Add inline comments like in Google Docs and send to agent. Share Markdown as a link that your team can review instantly. Perfect for working with agents: Claude Code, ChatGPT, Cursor, OpenClaw, and more. Your content says local. Free to use. No account required. After installing, in extension settings/details, enable “Allow access to file URLs”. Visit https://markside.app to learn more. READ • Instant rendering — Open a Markdown file and it renders immediately • Document outline — Browse an automatically generated right-side table of contents • Rich Markdown — Support headings, lists, tables, images, code, all common markdown • Extended syntax — Render task lists, footnotes, wikilinks, and linked URLs • Syntax highlighting — See beautiful code blocks for every major language • Mermaid diagrams — Render flowcharts, sequence diagrams, Gantt charts, and more • YAML frontmatter — Display document metadata; great for SKILL.md etc. • GitHub alerts — Render Note, Tip, Important, Warning, and Caution callouts REVIEW • Inline comments — Select text and leave a comment, like commenting in a Google Doc • Quick comment presets — Instantly save a preset comment (Clarify, Verify, Condense, and more) • Review History — See a reviewer's comments alongside your own, each anchored to its passage • Agent-ready prompts — Copy any comment as a ready-to-paste prompt for your coding agent SHARE • One-click Link Snapshot — Turn a local file into a shareable, readable link — no server, no account • Bring your review along — Optionally include your comments so feedback travels with the link • Reviewed Snapshots — Recipients can add their own feedback and share it back as a new link EDIT • In-place editing — Make quick changes without LLM roundtrips • Three modes — Choose Preview, Source, or live Split view • Live preview — Edit beside a responsive rendered document • CodeMirror editor — Syntax highlighting, autocompletion, keyboard shortcuts, undo history, etc. • Formatting toolbar — Quick insert tables, images, links, etc. without remembering syntax • Emoji insert - Quick insert emoji like 🔴 🟢 🟠 ✅ ❌ ⚠️ commonly used in .md docs • Manual or auto save — Save with Cmd+S / Ctrl+S or auto save with debounced • Conflict protection — Review changes before overwriting a file modified on disk NAVIGATE • Folder browsing — Open local folder to explore your whole project • All files — See every file type in the tree, not just Markdown • Quick switcher — Press Cmd+P / Ctrl+P to find a file in the open folder • Smart matching — Connect each local file to the right saved folder automatically • Relative links — Follow links between nearby local documents • Compact breadcrumbs — Browse the current file path without crowding the toolbar • Fuzzy search — Search across the entire folder as you type OTHER • PDF export — Create a clean, light-theme document through Chrome's Save to PDF workflow • CJK support — Export documents containing Chinese, Japanese, and Korean text correctly • Source files — View supported text and code files directly in the editor • Image viewer — Open local images without leaving Markside • Theme toggle — Switch themes instantly without reloading the page • Full width — Expand the document across the available browser space • Free access — Use every local feature with no account required WHAT'S NEW IN 1.3.0 • Source opens at full width for every text file, with width, word wrap, and copy in one Source options menu • Preview has its own full-width toggle, so Preview and Source keep independent widths in Split view • The code editor toolbar shows the current filename • Narrower scrollbars in the file tree • Zoom, pan, and reset Mermaid diagrams • Expand Mermaid diagrams to fill the browser viewport • Switch between selecting diagram text and dragging to pan with a clearer segmented control • The outline highlights your current section as you scroll • Collapsible sections now have bordered containers and arrows that show their open state • Task checkboxes have stronger outlines and green checkmarks for completed items • Import a review using the labeled Import button in the Review header • Send feedback by email from Settings or the optional Store review prompt • Expanding deeply nested folders no longer compresses file tree rows • Selected text stays highlighted after switching tabs while writing a review comment • Copy reviews that contain only imported comments • New comment editors receive focus so you can start typing immediately SET UP IN 30 SECONDS 1. Install Markside from the Chrome Web Store. It's free, with no account required. 2. In extension settings, enable “Allow access to file URLs.”. 3. Open any .md file in Chrome. Markside takes over automatically. PRIVACY Your files stay local. Everything is read directly in Chrome. Markside does not upload file contents, paths, or folder structure. Markside collects no analytics or telemetry. Directory and file handles are stored only in your browser's IndexedDB. COMPATIBILITY Chrome and Chromium-based browsers such as Edge, Brave, and Arc are supported. Firefox and Safari are not supported.