Diagram Editing Tool

What does MermaidViewer do?
Our tool is a fast and intuitive online Mermaid editor that turns plain text into beautiful, professional diagrams. Write Mermaid syntax, preview changes instantly, and export your charts for documentation, websites, or presentations — all in one place.
What are some unique features of mermaidviewer.com?
We support all Mermaid.js diagram types including: flowcharts, sequence diagrams, class diagrams, state diagrams, entity relationship diagrams, user journey diagrams, Gantt charts, pie charts, requirement diagrams, Git graphs, C4 diagrams, mind maps, and timelines.
Can a user use MermaidViewer for free?
Enjoy all basic features for free — every user comes with a usage limit.
How does MermaidViewer's AI-Assisted Coding feature work?
MermaidViewer's AI-Assisted Coding feature allows users to convert text descriptions into Mermaid code using the "Generate with GPT-4" button. This feature leverages AI technology to assist in generating the appropriate diagram code, simplifying the process for users who may be unfamiliar with Mermaid syntax. It enhances productivity by speeding up diagram creation.
What are the benefits of using MermaidViewer for diagram export?
MermaidViewer offers Smart Export, allowing users to save their diagrams in multiple formats such as SVG, PNG, and Markdown. Users can customize the export with different DPI settings and choose between light and dark themes. This flexibility ensures high-quality diagrams suitable for various professional and personal use cases, enhancing the utility of Mermaid diagrams in diverse contexts.
What are the different pricing plans available for MermaidViewer?
MermaidViewer offers three pricing plans to cater to various needs:
- Free: Offers 3 diagrams, 5 AI conversations per day, low-res PNG export with a watermark, and basic sharing. Ideal for beginners.
- Starter ($69.99/year): Provides 30 diagrams, 500 AI conversations per month, high-res PNG export without watermark, unlimited sharing, and 30 version history. Suitable for individual users who require more features.
- Pro ($119.99/year): Allows unlimited diagrams, AI conversations, and provides all export formats (PNG/JPG/PDF/SVG), advanced sharing, and statistics. Comes with 100 version history, personal notes, annotations, and priority support. Best suited for professional developers needing comprehensive features.


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