Mermaid Viewer is an online Mermaid diagram editing and preview tool for developers, with the goal of letting users create and share Mermaid diagrams directly in the browser, avoiding the complex configuration of local editors.
Purpose: Used to quickly write, preview, and export Mermaid-format diagrams, suitable for creating and sharing schematic diagrams such as flowcharts, timelines, and collaboration processes.
Main capabilities:
- Live preview: Instantly shows diagram changes while you type Mermaid code, with no need to click a "Render" button.
- AI-assisted coding: Provides a "Generate with GPT-4" button that can convert text descriptions into Mermaid code.
- Export and themes: Supports saving as SVG, PNG, and Markdown, allows custom DPI, and provides dark/light themes.
- Smart debugging: Supports syntax error highlighting and automatic correction suggestions.
- Real-time collaboration: Lets you share an editor link so team members can edit diagrams together.
- Enterprise integration: Provides private Docker deployment and role-based access control.
- Templates: Provides preset diagram templates, including governance committee decision processes, semester timelines, course lifecycles, wireframe collaboration processes, and more, making it easy to get started quickly.
How to use: You can start using it without registering. The basic process is: enter Mermaid code, preview the diagram in real time, and export to formats such as SVG/PNG/PDF. Optionally use the AI button to generate code from text, or invite team collaboration via a shared link. Enterprise users can choose private Docker deployment.
Use cases: Individuals or teams quickly creating professional diagrams; developers writing technical documentation or process descriptions; displaying timelines and course flows in educational scenarios; expressing processes from collaborative design to engineering delivery; enterprise environments that require private deployment and access control.
Limitations and notes:
- The free version includes 5 AI conversations per day, low-resolution PNG export (with watermark), and no version history.
- The personal paid version (most popular) provides 500 AI conversations per month, high-resolution PNG export (without watermark), unlimited sharing, and 30 version history entries.
- The professional developer version provides unlimited diagrams, unlimited AI conversations, all formats (PNG/JPG/PDF/SVG), advanced sharing and statistics, 100 version history entries, personal notes and annotations, and priority support.
- The official page states "completely free, no registration required," but the pricing section also lists paid plans; specific billing and limitations are subject to the official page.
- Data is kept in the browser, and the official statement says nothing is stored.
- Some feature details (such as the upper limit on the number of collaborators, the specific way version history works, etc.) are not yet provided.
