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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Markdown to mind map, drawn in your browser

Turn an outline into a mind map - here in this tab, with nothing uploaded.

How to markdown to mind map

Paste an outline: headings and nested lists.
Click a branch to fold or unfold it.
Save the map as SVG or PNG.

Why this one stays private

Outlines are thinking in progress. This draws yours in the tab, and nothing is sent anywhere.

Questions

How is the map built?

The first heading is the centre. Lower headings and list items become branches, nested as deep as the outline goes.

Can I edit the map directly?

Edit the text on the left and the map redraws as you type.