Mermaid mind map online: paste an AI reply, export PNG, Word, PowerPoint, PDF

Ask ChatGPT or Claude to write a mind map in Mermaid's mindmap syntax and paste the whole reply into the editor above. Diagramate picks out the code and renders the mind map; pick a theme and download a high-resolution image or drop it straight into Word or PowerPoint. Free, no sign-up, no watermark, and everything stays in your browser.

Three steps to a mind map

1. Click “No code yet?” under the editor and copy the mind map prompt to your AI assistant
2. Copy its whole reply and paste it. The code is detected and rendered; the explanation around it is ignored
3. Pick a theme and click “Download PNG”, or open the menu for SVG, Word, PowerPoint and PDF

Mind map syntax cheat sheet

mindmap
  root((Central topic))
    First-level branch
      Second-level branch
      Second-level branch
    First-level branch
      [Square node]
      (Rounded node)
      ((Circle node))

• Exactly one root node, on the second line. Levels come from indentation: two more spaces per level
• Write node text as plain words. Don't use - or * list markers: they become part of the text
• Each top-level branch gets its own colour, with a palette per theme

Frequently asked questions

How do I get the AI to output mind map code directly?

Send the mind map prompt from “No code yet?” under the editor. The key is to say “use Mermaid's mindmap syntax”; without it, assistants often reply with a markdown list instead.

What does Mermaid mind map syntax look like?

The first line is mindmap, the second line is the root node root((Topic)), and every level below is indented two spaces more than the previous one. Nodes can have shapes: [square], (rounded), ((circle)), {{hexagon}}.

What does “There can be only one root” mean?

The indentation is off: a mind map has exactly one root, and every other node has to be indented under it. The error bar names the line and the node, and “AI fix” can straighten out the indentation for you.

Can I export to Word or PowerPoint?

Yes. PNG, SVG, PDF, Word and PowerPoint are all free, with no sign-up and no watermark. Word and PowerPoint embed a high-resolution image and append the source code so you can come back and edit.

Flowcharts, sequence diagrams, Gantt charts and the other types: open the editor, or go back to the Diagramate home page