Sankey diagram generator
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Sankey diagram
Show how quantities flow between stages, categories, or systems. Create a private, publication-ready sankey diagram directly in your browser without transmitting sensitive rows off-device. Data is processed locally on your hardware with zero server uploads, enabling instant export to SVG, PNG, and Excel data.
Edit the data, then export.
Everything runs in your browser. Your data is not uploaded.
Data
Paste tab-separated data from Excel or edit the cells directly.
Paste or import table data
Paste a header row, or choose a local CSV/TSV file. Files are read in this browser and capped at 500 rows.
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Preview
Sample preview of the example data. The live chart takes over as soon as you start working.
SVG, PNG, and Excel exports are generated locally in this browser. PowerPoint export is temporarily unavailable while its dependency path is reviewed for a high-severity image parser advisory.
Multi-Variable Correlation & Flow Mechanics
A Sankey diagram is a flow visualization where the width of the links or bands is strictly proportional to the flow quantity. It is highly effective for mapping out resource allocations, energy transfers, budget breakdowns, or user journeys across multiple stages. By tracking inputs as they split into various outputs, the diagram helps identify major pathways, bottlenecks, and inefficiencies in a directed network. All data processing and rendering happens completely locally on your device, guaranteeing that your sensitive flow data is never uploaded to any external server.
Coordinate & Matrix Data Structure
Format input columns for sankey diagram with explicit headers and numerical measurements. Verify that rows represent discrete categories or observations without unformatted symbol artifacts.
Sample Observation Matrix
| Source | Target | Flow ($M) |
Correlation Traps & Analytical Guidelines
- Ensure sufficient visual distinction for sankey diagram marks across standard and high-contrast viewports.
- Align text labels horizontally whenever possible to improve cognitive readability for sankey diagram elements.
- Double-check scale boundaries and zero-anchors before exporting sankey diagram presentation artwork.
- Data shape
- Source, target, and numeric flow value columns
- Exports
- SVG, PNG, and Excel data; PowerPoint export is temporarily unavailable pending dependency review.
How it works
You edit a table in this page. The renderer draws an SVG from those rows in your browser, then you can download SVG, PNG, or Excel data. The table is not uploaded to any external processing server.
Frequently asked questions
What is the primary visual rule in a Sankey diagram?
Link width is strictly proportional to volume; flow is conserved across nodes (inputs equal outputs plus losses).
Reviewed 16 August 2026.