Edit Markdown as source or formatted text. Switch with Ctrl+E.
Free and open-source — use it in the browser or download the desktop app for Windows, macOS, and Linux. Lightweight native binary, no account, no vault.
Source and visual editing, with tabs, a minimap, and keyboard shortcuts.
Toggle between raw markdown with syntax highlighting and a rich WYSIWYG visual editor.
Ctrl+E to switchBuilt with Tauri and Rust for Windows, macOS, and Linux.
Multiple documents in tabs. Undo history, scroll position, and cursor preserved when switching.
Bold, italic, headings, links, lists, code blocks — via toolbar buttons or keyboard shortcuts.
Use the document overview on the right to jump to another part of your file.
Copy for AI wraps your document in a clean fenced block ready to paste into ChatGPT or Claude. Clean AI Paste strips zero-width characters and curly quotes. A live token estimate sits in the status bar.
Ctrl+Shift+A to copy for AIThe desktop app checks for new versions on launch and updates itself — no reinstalling. Trigger it any time from Help → Check for Updates.
MIT licensed. Free to use, modify, and distribute. Built in the open on GitHub.
Write the way you think.
The refactor is nearly complete. Focus on performance and cleanup.
Tauri v2Write in raw markdown or rich text — your choice.
Stay in the flow. Everything has a shortcut.
Free and open source. Always.
Or use it right now — open the browser version →
MDE is a free, open-source markdown editor built with Tauri and React. It gives you two editing modes in one window: a raw source editor (powered by CodeMirror) with syntax highlighting and a minimap, and a rich visual editor (powered by Milkdown) for formatted live-preview writing. Switch between them instantly with Ctrl+E.
The desktop app is built with Tauri and Rust, has no telemetry, requires no account, and runs on Windows, macOS, and Linux. A browser version is available with no install required.
Yes, completely free — forever. MDE is MIT licensed and open-source on GitHub. There is no trial period, no paid tier, no premium plan, and no feature gating. The browser version at /mde/app/ is also free to use directly without downloading anything.
Yes. The full editor — including dual-mode editing, tabs, and minimap — is available at seveneves.ai/mde/app/. No sign-up, no extension, no install. It is a good option if you are on a locked-down machine or just want to try it before downloading. The desktop app adds native file system access (open and save local files directly) and works offline without a browser.
MDE runs on Windows, macOS, and Linux. The desktop app ships as .exe / .msi for Windows, .dmg for macOS (Intel and Apple Silicon), and .deb / .AppImage / .rpm for Linux. If you prefer not to install anything, the full editor is also available in the browser at seveneves.ai/mde/app/ — same features, no download.
MDE has no built-in chatbot — it is an editor, not an assistant — but it is built to work alongside ChatGPT and Claude. Copy for AI (Ctrl+Shift+A) wraps the whole document in a fenced code block — with a fence long enough that internal code blocks cannot break it — so you can paste it into an LLM without formatting loss. Clean AI Paste strips the invisible junk that AI and word-processor output carry: zero-width characters, non-breaking spaces, and curly quotes. And a live token estimate in the status bar (approximately characters ÷ 4) tells you at a glance whether a document fits a model's context window.