Productivity
Draw a UML diagram
Sketch a sequence diagram here and download a PNG. Class boxes, activity flows, UML templates and SVG export open in the full Board on the desktop.
Try it here, no account neededThis tool didn't load
Nothing was sent anywhere — whatever you added stayed on your device. Open the full tool, or reload the page.
Save and continue on the desktop
Download or copy your result here first. Open the free desktop to save to Files or use more features.
- Sticky notes, diagrams and ready templates
- Save to Files when you continue on the desktop
- Every tool in one place, no new tabs
After you download, continue on the desktop for Files or the full app.
What UML Diagram can do
UML shapes developers use
In the full Board: class boxes with compartments, lifelines, actors and state nodes, plus arrows that carry a label for a message or an association. This page has lifelines and arrows.
One-click templates
In Board, insert a login sequence (User → API → DB), a two-class diagram, or an activity flow with decisions, then rename and edit it in place.
What you take with you
A PNG of the lifelines and arrows you drew here. In Board the same diagram saves itself and exports as SVG, PDF or JSON.
Related apps
Questions
Which UML diagram types are supported?
In Board: sequence, class and activity templates, plus tools for classes, lifelines, actors and states. This page draws a quick sequence sketch with lifelines and arrows.
Should I use UML or BPMN?
UML for how software behaves: which object calls which, and what a class holds. BPMN for a business process with people, steps and decisions. Board has templates for both.
Where is my diagram stored?
Nowhere until you take it: a reload clears this page, so download the PNG or open it in Board, where your lifelines arrive as shapes and save themselves.
Can I continue from this page?
Yes. Download a PNG, or open it in the free desktop: your lifelines and arrows arrive on a new board as shapes you can move, rename and connect.