FlowViz
Free, private, instant-preview Mermaid diagram editor.
FlowViz launched on March 13, 2026.
What it does
Create Mermaid diagrams online for free. FlowViz is a private, live editor with instant preview and clean SVG exports. No login or signup required.
Create Mermaid diagrams online for free. FlowViz is a local-first, live editor with instant preview and clean SVG exports. No login or signup required.
FlowViz turns plain Mermaid syntax into crisp SVG diagrams as you type — right in your browser, with no account and nothing to install. A Mermaid editor is usually a one-way street: you type, it draws. FlowViz goes both ways, with no account to create first. Select a node on the canvas and change its shape, colour or label — the Mermaid source rewrites itself, and one undo takes back the whole edit. Your file stays the source of truth; nothing is generated behind your back. Available for flowcharts today. Every other diagram type renders and exports exactly as before. Diagrams live in your browser’s localStorage — no account, no cloud sync. Nothing is uploaded unless you create a short link…from flowviz.app
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