UML Sequence Diagram Maker

A UML sequence diagram maker is a tool that helps you visualize how objects or systems interact over time by drawing message flows between participants. MakeCharts combines an AI generator with a visual editor so you can create standard UML sequence diagrams without writing any notation manually.

No. Just describe your interaction in plain language and the AI builds the diagram using correct UML conventions. You can then refine participants, arrow types, and notes using the config panel — no syntax required at any point.

You can create any interaction flow including login and authentication sequences, API request-response chains, microservice communication, database transactions, user journeys, and event-driven flows. The tool supports all standard arrow types — solid, dotted, asynchronous, and cross-terminated.

Yes. You can attach notes positioned left of, right of, or spanning one or two participants to annotate business rules and edge cases. Activation bars can be toggled per message to show exactly when each participant is active during the sequence.

Yes — all core chart types including sequence diagrams are free to create, customize, and download. Free accounts include AI credits for generation. Paid plans unlock more AI credits, CSV upload, and advanced export options for teams with higher volume.

Download your diagram as a PNG or SVG for use in docs, slides, and wikis. Copy a shareable link to send via Slack or email. Pro and Plus plans include embed codes for adding live diagrams to websites or internal tools.

Absolutely. MakeCharts is fully browser-based — no download, no install, no account required to get started. Open the tool, describe your flow, and your sequence diagram is ready to share.

There is no hard limit on participants. You can add as many actors and components as your flow requires, assign each a display name and type, and the diagram layout adjusts automatically.

The tool supports eight arrow styles: solid line, dotted line, solid with arrowhead, dotted with arrowhead, solid with cross, dotted with cross, async solid, and async dotted. This covers all standard UML message types including synchronous calls, async events, and return messages.

Yes. Toggle 'Show sequence numbers' in the display settings and each message is automatically numbered in order. This is especially useful for technical reviews, test case mapping, and documentation where stakeholders need to reference specific steps.