Draw any diagram, right in your browser
Diagram.RS is a free online diagram maker for developers, students and teams. Write simple text using the Mermaid syntax and instantly see a flowchart, sequence diagram, or other diagram rendered live. Everything runs locally in your browser – nothing is uploaded to a server.
Diagram code
Preview
Theme
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Try an example
How to create a diagram online
- Choose a diagram type below, or start typing Mermaid syntax directly in the code editor.
- Watch the preview update live as you type – no 'render' button needed.
- Use the example buttons to load ready-made templates for flowcharts, sequence diagrams and more.
- Download your diagram as SVG or PNG once you're happy with it.
Frequently asked questions
- Is Diagram.RS free to use?
- Yes. The editor, preview and export to SVG/PNG are completely free, with no sign-up required.
- What diagram syntax does Diagram.RS support?
- Diagram.RS uses the Mermaid syntax, a simple text-based language for describing flowcharts, sequence diagrams, ER diagrams, class diagrams, Gantt charts and more.
- Does my diagram data get uploaded anywhere?
- No. Diagrams are rendered entirely in your browser. Nothing you type is sent to our servers.