Create a PlantUML activity diagram online, map decisions and parallel work, preview the workflow, and export it as PNG or SVG.
Start with the Activity Diagram template, edit the PlantUML source, and preview the result live.
Use this focused activity diagram tool for quick previews and exports. Open the full editor for AI generation, syntax repair, sharing, and saved projects.
Model activities, decisions, branches, loops, parallel paths, start and stop points, and swimlanes in an editable PlantUML workspace with live preview and PNG or SVG export.
Start from valid PlantUML source designed for a practical activity diagram.
See the rendered diagram update as you edit the PlantUML source.
Learn the syntax and modeling choices used for business processes, approval flows, algorithms, user journeys, incident runbooks, and service workflows.
Download a shareable PNG or scalable SVG from the same source.
Create and preview PlantUML without installing Java, Graphviz, or an IDE extension.
Move to the full editor for AI generation, repair, sharing, and saved projects.
Use the built-in template to create a activity diagram for business processes, approval flows, algorithms, user journeys, incident runbooks, and service workflows.
Start with the built-in Activity Diagram template.
Replace the sample actions with the steps in your workflow.
Add if, repeat, while, or fork blocks where the flow branches or runs in parallel.
Preview the workflow and check that every branch reaches a clear outcome.
Export the activity diagram as PNG or SVG.
Learn the core syntax and modeling decisions behind a useful activity diagram, then apply them directly in the online editor above.
This editor uses PlantUML's current activity diagram syntax, which is recommended for new diagrams. Begin with start, write each action between colons, and finish with stop or end. PlantUML connects consecutive activities automatically.
start
:Validate request;
:Create order;
stopUse if, then, else, and endif for mutually exclusive outcomes. Label the outgoing paths with short answers such as yes and no so the decision remains clear when the diagram grows.
Use repeat or while for repeated actions. Use fork, fork again, and end fork when independent activities can run concurrently, such as sending a notification while recording analytics.
Prefix activities with a swimlane such as |Customer| or |Support Team| when ownership matters. Swimlanes turn a generic process into a responsibility map without changing the underlying flow.
The editable example demonstrates a practical activity diagram. Change the source, check the live preview, and export the version you need.
@startuml
start
:User submits order;
if (Stock available?) then (yes)
:Process payment;
:Confirm order;
else (no)
:Notify out of stock;
:Cancel order;
endif
stop
@endumlUse these related tools when you need a different export format or a full PlantUML editing workflow.
Browse the complete OnUML matrix of online PlantUML tools and converters.
View all PlantUML toolsUse the general editor when you want to switch freely between diagram types.
Open the general editorCreate and export a focused sequence diagram with a built-in template.
Create a sequence diagramPlantUML keeps activity diagrams in reviewable text, making them easier to update, version, reuse, and export as the design changes.
Open directly into a Activity Diagram template instead of adapting an unrelated example.
Store the diagram as readable text that works well in documentation and version control.
Check structure, labels, and relationships before exporting the rendered diagram.
It is a browser-based editor that starts with a Activity Diagram template and lets you edit PlantUML source, preview the rendered diagram, and export PNG or SVG without local setup.
Use it to model activities, decisions, branches, loops, parallel paths, start and stop points, and swimlanes. Common uses include business processes, approval flows, algorithms, user journeys, incident runbooks, and service workflows.
Use an if block with then and else branches, and close it with endif. Add short labels to each branch to show which condition leads to each path.
Yes. Use fork, fork again, and end fork to model activities that happen in parallel before the workflow joins again.
Yes. Preview the diagram, then download PNG for slides and quick sharing or SVG for scalable documentation and web use.
No. The online tool uses a server-backed preview, so you can edit and render the diagram directly in the browser.
Open the full OnUML editor for AI generation, syntax repair, sharing, saved projects, and multi-format diagram workflows.