Create Mermaid Diagrams: Flowcharts, Sequence Diagrams & More

Create professional diagrams using Mermaid syntax. Generate flowcharts, sequence diagrams, class diagrams, Gantt charts, and more - all from simple text-based syntax. No design skills required.

What is Mermaid?

Mermaid is a text-based diagramming language that lets you create diagrams using code. It's perfect for:

• Documentation and technical writing
• Software architecture diagrams
• Process flows and workflows
• Database schemas
• Project timelines

Supported Diagram Types

1. Flowcharts

Perfect for process flows, decision trees, and algorithms:

flowchart TD
    A[Start] --> B{Decision}
    B -->|Yes| C[Action 1]
    B -->|No| D[Action 2]
    C --> E[End]
    D --> E

Use Cases: Process documentation, algorithm visualization, decision trees

2. Sequence Diagrams

Show interactions between components over time:

sequenceDiagram
    participant User
    participant API
    participant Database
    
    User->>API: Request Data
    API->>Database: Query
    Database-->>API: Results
    API-->>User: Response

Use Cases: API interactions, system communication, user flows

3. Class Diagrams

Visualize object-oriented relationships:

classDiagram
    class User {
        +String name
        +String email
        +login()
        +logout()
    }
    class Admin {
        +manageUsers()
    }
    User <|-- Admin

Use Cases: Software architecture, OOP design, system structure

4. State Diagrams

Model state machines and transitions:

stateDiagram-v2
    [*] --> Idle
    Idle --> Processing: Start
    Processing --> Completed: Success
    Processing --> Error: Failure
    Completed --> [*]
    Error --> Idle: Retry

Use Cases: State machines, workflow states, process states

5. ER Diagrams

Design database schemas:

erDiagram
    USER ||--o{ ORDER : places
    ORDER ||--|{ ORDER_ITEM : contains
    PRODUCT ||--o{ ORDER_ITEM : "ordered in"
    
    USER {
        string id PK
        string name
        string email
    }
    ORDER {
        string id PK
        datetime created_at
    }

Use Cases: Database design, data modeling, schema documentation

6. Gantt Charts

Create project timelines:

gantt
    title Project Timeline
    dateFormat YYYY-MM-DD
    section Phase 1
    Planning    :a1, 2024-01-01, 7d
    Design      :a2, after a1, 10d
    section Phase 2
    Development :b1, after a2, 14d
    Testing     :b2, after b1, 7d

Use Cases: Project planning, sprint timelines, milestone tracking

7. Pie Charts

Visualize data distributions:

pie title Tool Usage
    "JSON Tools" : 35
    "Encode/Decode" : 25
    "HTTP Tools" : 20
    "Viewers" : 20

Use Cases: Data visualization, statistics, distribution analysis

8. Mind Maps

Organize ideas and concepts:

mindmap
    root((Ideas))
        Category A
            Idea 1
            Idea 2
        Category B
            Idea 3
            Idea 4

Use Cases: Brainstorming, knowledge mapping, concept organization

9. Git Graphs

Visualize Git branching:

gitGraph
    commit id: "Initial"
    branch develop
    checkout develop
    commit id: "Feature"
    checkout main
    merge develop

Use Cases: Git workflow documentation, branch visualization

Using Our Mermaid Editor

1. Select a diagram type from the template menu
2. Edit the Mermaid syntax in the editor
3. See live preview as you type
4. Customize themes (default, dark, forest, neutral)
5. Export as SVG or PNG
6. Save and share your diagrams

Mermaid Syntax Tips

• Use proper indentation for readability
• Add labels to connections for clarity
• Use different node shapes ([] for processes, for decisions, () for start/end)
• Style nodes with colors and classes
• Add notes for additional context

Best Practices

• Keep diagrams simple and focused
• Use consistent naming conventions
• Add descriptive labels
• Organize complex diagrams into subgraphs
• Test diagrams before sharing

Create beautiful diagrams instantly with our Mermaid Diagram Editor!