Mermaid Editor
Edit Mermaid diagrams with live preview, copy code, and export SVG or PNG.
Mermaid turns text into diagrams, which makes it perfect for documentation, architecture reviews, and README files. Utilitoo's Mermaid Editor gives you a split workspace: Mermaid source code on the left and a live rendered preview on the right that updates as you type.
Developers document microservice flows, product managers sketch user journeys, and engineering teams align on system design without opening a desktop diagramming app. Paste existing Mermaid from GitHub, Notion, or Confluence, tweak the syntax, and export polished SVG or PNG assets for slides and wikis.
Copy your code with one click, export vector SVG for crisp docs, or download PNG for presentations. The preview automatically follows your site theme, so diagrams look natural in both light and dark mode.
Everything renders locally in your browser on Utilitoo. Your diagrams are never uploaded to any server. Free, fast, and privacy-first for developers, technical writers, and teams who live in Markdown and docs-as-code workflows.
Live preview follows your site theme. Toggle light/dark mode from the header.
Diagram preview will appear here…
How to use
- Write or paste Mermaid code in the left editor panel.
- Watch the diagram render live in the preview on the right.
- Copy code or export SVG/PNG when your diagram is ready.
Frequently Asked Questions
What is a Mermaid editor?▼
A Mermaid editor lets you write diagram-as-code syntax and see the rendered result instantly. Utilitoo combines a code panel with live preview in one browser tab.
Can I export Mermaid diagrams as SVG or PNG?▼
Yes. Utilitoo includes Export SVG and Export PNG buttons that download your current rendered diagram directly to your device.
Does the Mermaid editor support dark mode?▼
Yes. The live preview follows Utilitoo's site theme, so diagrams render with appropriate colors in both light and dark mode.
Which Mermaid diagram types are supported?▼
Utilitoo supports common Mermaid types including flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, and Gantt charts.
Is my Mermaid code uploaded to a server?▼
No. Rendering happens entirely in your browser. Your diagram source and exports stay on your device.
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