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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.
Sep 1, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.