Free local tool

Sankey Diagram Maker

Turn source, target, and value rows into a bounded local Sankey flow diagram with an accessible flow table.

Private by design: inputs and local files stay in this browser tab. The tool sends no input to a server and stores nothing after the page closes.

JavaScript is required for the interactive tool.

Method and limits

Accepts 1-500 rows and up to 200 nodes, aggregates duplicate directed edges, requires positive finite values, and rejects self-loops and cycles. The deterministic layered SVG is local and executes no label markup.