State diagram maker (state machine)
Add the states, drag them into place and connect them with Connect blocks. Click a transition to type the event.
How to useThe states, and what moves from one to the next
Available in: 
State diagram maker (state machine): what it is for
Type the transitions between states, one per line, with the event that causes the change after the colon. The initial and final states are marked with [*], and names with spaces are declared once with state.
The drawing shows the path of an order, a ticket or a screen and helps you spot forgotten cases. Download it as PNG or SVG.
How to use
- Type the transitions between states.
- Add the event for each transition.
- Download the diagram as PNG or SVG.
When to use it
- Online store order status.
- Document approval flow.
- Systems modeling coursework.
Frequently asked questions
How do I write a transition?
State1 --> State2 : event. [*] marks the start (when it comes before the arrow) and the end (when it comes after). For a name with spaces, declare it first: state "Being packed" as packing, and use packing in the arrows.
What is a state diagram?
It is a drawing of the states something goes through, like an order, a support ticket or a screen, and of the events that lead from one state to another. It helps you not forget cases, such as canceling an order that has already shipped.
Can I group states?
Yes. Use state Name { ... } with the inner transitions inside the braces for a composite state. For a choice, declare state decision <<choice>> and leave it with one arrow for each path.
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.