Sequence Diagram

Build sequence diagrams visually with participants, calls, replies, notes, and nested branches. Export images, PlantUML or Mermaid; save and share cloud files.

Build an interaction visually

  1. Choose Blank diagram or the API request template.
  2. Add participants and ordered messages. Set calls, asynchronous messages, replies, and self-calls.
  3. Group branches with if/else, optional, loop or parallel fragments. Add notes, review checks, and fit the diagram width.

Save, share, and export

Sign in to save independent sequence diagram cloud files and share read-only links. Download or import editable JSON. Export PNG, JPEG, WebP, vector SVG, or PDF, and generate PlantUML or Mermaid text locally.

New diagrams stay in memory until saved or downloaded. Text imports and execution simulation are not supported. Enable JavaScript to use the visual editor.

Read the Sequence Diagram guide