Mermaid Viewer

Mermaid Sequence Diagram Viewer

Use Mermaid Sequence Diagram Viewer to inspect API calls, service interactions, and user journeys. Preview the diagram online, then export the rendered result for docs or architecture reviews.

Open online previewExport PNG or SVG

Sequence diagram viewer sample

Copy this example into the editor to preview it with Mermaid themes and layout presets.

sequenceDiagram
  participant Client
  participant API
  participant Worker
  Client->>API: Submit request
  API->>Worker: Queue job
  Worker-->>API: Return result
  API-->>Client: Show response

Preview, style, and export in one place

Mermaid Viewer keeps the workflow focused: paste Mermaid code, preview the rendered diagram, choose a theme or layout preset, then export PNG/SVG when the result is ready for documentation or slides.

Related Mermaid tools

Mermaid ViewerMermaid PreviewMermaid Diagram ViewerMermaid Flowchart ViewerMermaid Sequence Diagram ViewerMermaid Themes

Frequently Asked Questions

Can Mermaid Viewer render sequence diagrams?
Yes. Mermaid Viewer supports Mermaid sequence diagrams and other Mermaid diagram types.
Can I export a sequence diagram as SVG?
Yes. Once the sequence diagram renders, you can export it as SVG or PNG from the editor.