What is MermaidViewer?

MermaidViewer is the ultimate online tool for creating, editing, and sharing Mermaid diagrams.Instantly see live previews as you type, use AI-assisted code generation to speed up diagram creation, and export your work in SVG, PNG, or Markdown with ease.

Collaborate in real-time with team members or work solo — no installation required.Perfect for flowcharts, sequence diagrams, Gantt charts, and other technical visualizations, MermaidViewer combines speed, accuracy, and simplicity in one intuitive platform.

Ideal for developers, product managers, and teams who want professional-quality diagrams quickly and efficiently.

MermaidViewer pricing Free trial

Free $0

Starter $69.99/year

Pro $119.99/year

Verify on the official pricing page.

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MermaidViewer user reviews

Based on 4 reviews, 75.0% of users recommend MermaidViewer, rated highly for ease of use.

recommend

don't

4 reviews

Liked for

Worth the price 3 of 3

Easy to use 3 of 3

All key features 3 of 3

Good integrations 1 of 3

Disliked for

Hard to use 1 of 1

Missing features 1 of 1

Lacks integrations 1 of 1

Would you recommend MermaidViewer?

Recommend this tool?

MermaidViewer's key features

In-browser Mermaid diagram editor with live preview that renders Mermaid code
Support for multiple diagram types (flowchart, sequence, class, state, ER, Gantt, timeline, mind map, C4, Git) with customizable templates
AI-assisted tools: text-to-Mermaid code (GPT-4), syntax error highlighting, and auto-correction suggestions
Export formats: SVG, PNG, PDF, and Markdown with custom DPI settings
Collaboration and access controls: real-time co-editing, shareable links, version history, and role-based access control

MermaidViewer use cases

Design complex system architecture and network diagrams using Mermaid Viewer’s AI-assisted text-to-diagram and pre-built templates, preview changes live with syntax error auto-correction, collaborate in real-time with engineers, and export high-resolution SVG/PNG/PDF for presentations or documentation
Convert product requirements, meeting notes, or user stories into clear flowcharts and process diagrams using Mermaid Viewer’s text-to-code generator, fix syntax issues automatically, maintain version history for traceability, and embed diagrams in Markdown for your docs site
Maintain team-ready technical documentation by creating and updating diagrams collaboratively in Mermaid Viewer, deploy the editor via Docker or VS Code for seamless integration into developer workflows, and export or embed polished diagrams for release notes, onboarding guides, and architecture reviews