What It Does

Mermaid Viewer is an online diagram editor that lets developers and teams create professional diagrams directly in the browser using Mermaid syntax. It provides instant live preview as you type, eliminating the need for local installations or render buttons. The tool supports multiple diagram types including flowcharts, timelines, wireframes, and more.

Key Features & Capabilities

• Live Preview: See diagram changes in real-time as you type, with no manual rendering required • AI-Assisted Generation: "Generate with GPT-4" button converts text descriptions into Mermaid code automatically • Smart Export: Save diagrams as SVG, PNG, JPG, or PDF with customizable DPI settings and dark/light theme options • Smart Debugging: Syntax error highlighting with auto-correction suggestions to help catch issues quickly • Real-time Collaboration: Share editor links with team members for co-editing diagrams • Template Library: Pre-built templates for common use cases including governance flows, academic timelines, course lifecycles, and wireframe collaboration workflows • Version History: Track changes with up to 100 saved versions (Pro plan) • VS Code Extension: Integrate directly into your development workflow

Who It's For

Mermaid Viewer is designed for developers, DevOps engineers, technical architects, and product teams who need to create and share technical diagrams quickly. It's particularly valuable for teams documenting architecture, designing workflows, mapping processes, or creating visual documentation.

Privacy & Deployment

The tool operates with a privacy-first approach—data stays in your browser by default. For enterprise needs, it offers Docker private deployment with role-based access control. No signup is required to start creating diagrams, making it instantly accessible for quick diagramming tasks.

What Makes It Different

Unlike traditional diagramming tools that require desktop applications or complex setup, Mermaid Viewer works entirely in the browser with zero installation. The AI-assisted code generation and smart debugging features streamline the creation process, while the VS Code extension brings diagram creation directly into the developer workflow.