UML activity diagram maker
Add the actions and decisions, drag them into place and connect them with Connect blocks. Click an arrow to type yes or no.
How to useThe step by step of a process
Available in: 
UML activity diagram maker: what it is for
Type the activities of the process and connect them with arrows, with text on the arrows that leave a decision. The example already includes the start circle, the end circle and the fork and join bars for activities that happen at the same time.
The diagram draws as you type and downloads as PNG or SVG for your assignment or docs.
How to use
- Type the activities and decisions.
- Connect everything with arrows, with yes and no on decisions.
- Download the diagram as PNG or SVG.
When to use it
- Mapping a business process.
- UML coursework.
- Documenting a business rule.
Frequently asked questions
How do I write the activities?
Give each step a short id and put the text in square brackets: pack[Pack the products]. Decisions go in curly braces: stock{In stock?}. Then connect them with arrows: pack --> ship, and with text on the arrow: stock -- yes --> pack.
How do I make the start, the end and the parallel bars?
The example already has all three: start@{ shape: f-circ } is the filled start circle, end@{ shape: fr-circ } is the end circle and fork1@{ shape: fork } is the bar that opens or joins paths that happen at the same time.
How is it different from a flowchart?
They are similar. The activity diagram is the UML one, used in systems analysis, and has its own symbols for start, end and parallel activities. A flowchart is freer and common for business processes.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.