How-to · Schema Editor

Browser Sequence Diagram Editor with Mermaid Syntax Export

How to draw sequence diagrams, participant lifelines, and message interactions visually while exporting clean Mermaid sequence syntax.

Open Schema Editor Add to VS Code

Free · runs in your browser · your files are never uploaded

TLDR

Writing sequence diagrams using pure Mermaid text syntax makes it difficult to visualize complex multi-actor flows without constant re-rendering. GINEXYS Schema Editor Sequence mode lets you drag participant lifelines, draw synchronous/asynchronous message arrows, place activation bars, and wrap interactions in Alt/Loop fragment boxes, exporting bi-directionally to standard Mermaid sequence syntax (.mmd) or SVG.

The Search Query: Browser Sequence Diagram Maker Mermaid Export

System architects search for:

"sequence diagram editor browser export mermaid syntax"
"visual sequence diagram maker generate mmd file"
"sequence diagram tool with activation bars and fragment boxes"

Canvas Lifelines and Interaction Controls

In Sequence mode, adding Actor or System participant nodes automatically projects vertical lifelines down the canvas page:

Sequence Element	Visual Canvas Tool	Mermaid Export Token
Synchronous Request	Solid arrow (`->>`)	`Client->>Server: Request`
Asynchronous Message	Open arrow (`->`)	`ServiceA->ServiceB: Async Event`
Return Response	Dashed arrow (`-->>`)	`Server-->>Client: 200 OK`
Activation Bar	Click lifeline → Toggle Activation	`activate Server` / `deactivate Server`
Alt / Loop Fragment	Draw Fragment Box	`alt Success ... else Error ... end`

Rule of thumb: use dashed return arrows for response payloads to keep sequence interaction flows clear and readable.

Exporting Bi-Directional Mermaid Syntax

Clicking Export Mermaid transforms visual scene graph nodes into clean .mmd syntax:

sequenceDiagram
    autonumber
    actor User
    participant Gateway as API Gateway
    participant Auth as Auth Service
User->>Gateway: POST /login     activate Gateway     Gateway->>Auth: Validate Credentials     activate Auth     Auth-->>Gateway: Token Issued     deactivate Auth     Gateway-->>User: 200 OK (JWT)     deactivate Gateway

Conclusion

Combining visual canvas dragging with bi-directional Mermaid syntax export makes system architecture documentation fast and syntax-error-free.

Schema Editor — Draw and edit wiring diagrams, schematics, ERDs, and state machines as real SVG.

Open Schema Editor Add to VS Code Source