Sequence Diagram Maker

A sequence diagram is a type of UML diagram that shows how objects or systems interact over time through a series of messages. It visualizes the order of communication steps between participants — such as users, services, or databases — making it easier to understand and document complex processes.

You describe your interaction in plain language — for example, 'Show a checkout flow between a customer, web app, payment API, and database.' The AI interprets your description, identifies the participants, sequences the messages, and selects appropriate arrow types automatically. You can then fine-tune everything in the visual config panel.

Yes — you can create and download sequence diagrams for free without signing up. Free accounts include AI credits to try AI-powered generation. Paid plans unlock more AI credits, SVG exports, embed codes, and file upload for data import.

Absolutely. MakeCharts runs entirely in your browser — no download, no install, no account required. Open the tool, describe or configure your diagram, and export it in seconds.

The tool supports 8 arrow types: solid line, dotted line, solid with arrowhead, dotted with arrowhead, solid with cross, dotted with cross, async solid, and async dotted. These cover synchronous calls, asynchronous events, responses, and error paths in standard UML notation.

Yes. You can attach notes positioned left of, right of, or over any participant. Notes are useful for explaining conditions, highlighting important steps, or flagging error-handling logic without interrupting the main message flow.

Yes. Each message can activate or deactivate the target participant, rendering an activation bar on that participant's lifeline. This visually shows when a service or actor is actively processing a request — a standard UML sequence diagram convention.

Once your diagram is ready, you can download it as a PNG or SVG image, copy a shareable link, or use an embed code to display it on your website or documentation platform. All sharing options are available directly from the tool.

A flowchart shows the logical steps in a single process — decisions, loops, and branches. A sequence diagram focuses on the communication between multiple participants over time, showing who sends what message to whom and in what order. Use sequence diagrams when the interaction between systems or actors is what matters most.

Yes. The display settings panel includes a 'Show sequence numbers' toggle. When enabled, each message is automatically numbered in order, making it easy for readers to follow complex multi-step interactions across many participants.