Markside: Markdown Viewer & Editor

Read, edit, and collaborate on Markdown with teammates and AI agents. Inline comment, outline, file tree, Mermaid, math, PDF export.

Open any .md file to read it beautifully rendered, edit it in place, comment inline, share it with teammate, and send your feedback to your AI agents to update the file. Free and no account required. Learn more at https://markside.app ❗ After installing, enable "Allow access to file URLs" on the extension's details page. ❗ Markside opens local Markdown files only. READ MARKDOWN • GitHub-flavored Markdown with tables, task lists, footnotes, and alerts • Syntax-highlighted code, Mermaid diagrams, and KaTeX math • Document outline, YAML frontmatter, themes, and Zen mode REVIEW MARKDOWN • Select text and leave inline comments, with one-click presets such as Clarify or Verify • Copy any comment as a prompt for your coding agent • Send a whole review to Claude Code, Codex, or another agent with the free Markside Agent Skill, and read its replies beside each comment (Beta): npx skills add ericjy/markside --skill markside -g • See additions and removals after the agent changes the file EDIT MARKDOWN • Start a New Draft from the extension popup, even when no Markdown file is open • Preview, Source, and live Split view • Formatting toolbar, keyboard shortcuts, and undo history • Save to disk with Cmd+S / Ctrl+S, or turn on Auto Save • Open a folder to browse its files and switch between them with Cmd+P / Ctrl+P SHARE MARKDOWN • Turn a Markdown file into a link, optionally with your comments • Export a clean PDF SET UP IN 30 SECONDS 1. Install Markside. 2. In extension settings, enable "Allow access to file URLs." 3. Open any .md file in Chrome. Markside renders it automatically. WHAT'S NEW IN 1.8.0 • Start a New Draft from any tab and save it where you choose • Embed interactive HTML visuals in Markdown and review them with your agent • Include local images in encrypted Hosted Snapshots