Merflow turns Mermaid's text syntax into diagrams as you type — with a real code editor, real export options and zero setup. Free, no signup, and everything stays on your machine.
The editor that powers VS Code, with Mermaid syntax highlighting, keyword and arrow autocompletion, and full starter snippets for every diagram type.
A syntax error never breaks the view: the last valid diagram stays rendered, the failing line gets a red squiggle, and the overlay offers a one-click "Go to line" jump.
A built-in Mermaid reference covering flowcharts, sequence, class, state, ER, Gantt, pie, journeys, mindmaps, git graphs and timelines — with copyable, runnable snippets.
⌘K / Ctrl+K for every action — export, templates, themes, documents — plus platform-aware keyboard shortcuts.
Debounced rendering keeps the preview instant without re-rendering on every keystroke. Pan by dragging, zoom toward the cursor, auto-fit or jump to 100%.
The nodes on your cursor's line glow in the preview; click a node and the editor jumps to its line.
Light and dark UI, plus an independent diagram theme — default, dark, forest, neutral, base and more.
One shortcut hides all chrome for a full-bleed view of the diagram — ideal for meetings and screen shares.
Native SVG download, or PNG at 1×/2×/3× resolution with white, theme or transparent background. Copy either straight to the clipboard.
Share compresses the source into the URL itself — no accounts, no expiry, no server. Opening a link creates a new document, never overwriting your work.
Create, rename, duplicate and switch between named diagrams — all persisted locally in your browser.
Drag & drop .mmd, .mermaid or .txt files to open them; download your source as .mmd anytime.
Merflow has no backend for your content. Rendering, storage and export all happen client-side; Mermaid runs with securityLevel: 'strict' and the generated SVG is sanitized before it touches the DOM. The interface is fully bilingual (English/Spanish) and accessible — ARIA roles, focus management and keyboard navigation throughout.
No. Merflow runs entirely in your browser — no signup, no login, no server-side storage. Your diagrams are saved locally.
In your own browser (localStorage). Nothing is uploaded: the editor, the renderer and the export pipeline are all client-side.
The Share button compresses your diagram's source and encodes it into the URL hash. Whoever opens the link gets the full diagram as a new document — no database involved.
Merflow adds Monaco autocompletion with inline error markers, a multi-document workspace, a bilingual EN/ES interface, a template gallery with rendered previews and a built-in syntax cheat-sheet — while staying free and local-first.