rumdl — Markdown Linter

Real-time Markdown linting with auto-fix for GitHub and GitLab.

rumdl is a fast, privacy-first Markdown linter for your browser. Markdown processing happens locally via WebAssembly. Your Markdown content is never sent to the developer or any third party. Get instant feedback as you write issues, pull requests, comments, and wiki pages on GitHub and GitLab. Stop getting review comments about Markdown formatting. Features: • 70+ lint rules covering headings, lists, links, code blocks, and more • Keyboard-accessible line markers showing exactly where problems occur • Responsive warning panel with rule details, locations, and descriptions • Safe one-click fixes that never overwrite newer typing • Search, enable, disable, or configure rules from the extension popup • Automatically matches your site's dark or light theme • Platform-aware keyboard shortcuts for fast navigation Supported sites: • GitHub (issues, pull requests, comments, wikis, discussions) • GitLab (issues, merge requests, comments, wikis) Keyboard shortcuts: • Cmd/Ctrl+Shift+L — Toggle warning panel • Cmd/Ctrl+Shift+F — Fix all problems • Cmd/Ctrl+. — Fix problem at cursor • Cmd/Ctrl+Alt+] — Next warning • Cmd/Ctrl+Alt+[ — Previous warning Open source at github.com/rvben/rumdl-chrome-extension rumdl does not include analytics, advertising, tracking, accounts, or in-app purchases. Extension preferences can be synchronized by Chrome through your browser profile; they never contain Markdown content.