Free AI diagram generator
Turn text into diagrams in your browser — flowcharts, sequence, ER, UML, mind maps and more. Write Mermaid or a plain outline, render live, and export. Your text never leaves your device.
One step per line. Indent two spaces to branch beneath the line above.
From text to diagram in three steps
- 01
Type or paste
Write Mermaid, paste a diagram from a doc, or switch on Outline mode and type a plain list.
- 02
See it render
The diagram redraws live on your device as you type. Nothing is uploaded — ever.
- 03
Export or embed
Download SVG/PNG, copy the source, or copy a Markdown block for your GitHub README.
Why developers use it
Renders in your browser
Diagrams are drawn locally with Mermaid.js. Your text and diagrams never touch a server.
No signup, no watermark
No account, no email, no logo on your exports. Use it as much as you want.
Deterministic, no AI bill
Text-to-flowchart is a rule-based, on-device transform. No model is called, so it stays free and private.
Frequently asked questions
Is this AI diagram generator really free?
Yes — completely free, with no signup, no email and no watermark. There is no paid tier gating the rendering or exports.
How do I turn text into a diagram?
Write Mermaid syntax and it renders live, or switch on Outline mode and type a plain indented list to get a flowchart. Each line becomes a node and each indent becomes an arrow.
Are my diagrams uploaded to a server?
No. Rendering runs entirely in your browser with Mermaid.js. Your text and diagrams never leave your device. The rendering engine itself downloads once from a public CDN, then it is cached.
Is there an AI model involved?
The text-to-flowchart conversion is a deterministic, on-device transform — no language model is called. We keep any LLM layer off so the tool stays free, instant and private.
What can I export?
A vector SVG (scales perfectly), a PNG for slides and docs, the raw Mermaid source, or a ready-to-paste Markdown block that renders in a GitHub README.
What diagram types are supported?
Flowcharts, sequence diagrams, ER (database) diagrams, UML class diagrams, architecture diagrams, mind maps, Gantt charts and more — anything Mermaid renders.