What is a Sankey diagram?

A Sankey diagram is a flow visualization where the width of arrows or lines is proportional to the flow quantity. They are commonly used to visualize energy transfers, material flows, costs, or any process where quantities flow between nodes.

How do I create a Sankey diagram?

Enter your data in CSV format with three columns: Source, Target, and Value. Each row represents a flow from a source node to a target node with a specific value. The tool will automatically generate the diagram which you can customize with different styles and colors.

Is this Sankey diagram tool free?

Yes, this Sankey diagram maker is completely free to use. No signup or registration is required. You can create, customize, and export your diagrams without any cost.

What export formats are supported?

You can export your Sankey diagrams as PNG images for presentations and documents, or as SVG vector files for high-quality scalable graphics that can be further edited in design software.

Can I customize the appearance of my Sankey diagram?

Yes, you can customize flow styles (bundled, curved, straight, orthogonal), color palettes, fonts, node spacing, and more. You can also drag nodes to reposition them and use the optimize feature for better layouts.

Free Sankey Diagram Maker - Create Beautiful Flow Charts Online

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Sankey VisualizerFlow Diagram Tool

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📊Data31 rows

Primary Energy,Electricity Generation,45.2
Primary Energy,Direct Industrial Use,28.7
Primary Energy,Transportation,22.1
Primary Energy,Grid Losses,3.8
Electricity Generation,Residential,18.3
Electricity Generation,Commercial,15.4
Electricity Generation,Industrial Electric,8.9
Electricity Generation,Grid Losses,2.6
Direct Industrial Use,Manufacturing,16.2
Direct Industrial Use,Process Heat,8.5
Direct Industrial Use,Grid Losses,4.0
Transportation,Road Transport,14.8
Transportation,Aviation,4.2
Transportation,Maritime,3.1
Grid Losses,Waste Heat,10.4
Residential,Useful Energy,12.8
Residential,Waste Heat,5.5
Commercial,Useful Energy,10.9
Commercial,Waste Heat,4.5
Industrial Electric,Useful Energy,6.7
Industrial Electric,Waste Heat,2.2
Manufacturing,Useful Energy,11.3
Manufacturing,Waste Heat,4.9
Process Heat,Useful Energy,5.1
Process Heat,Waste Heat,3.4
Road Transport,Useful Energy,5.2
Road Transport,Waste Heat,9.6
Aviation,Useful Energy,1.5
Aviation,Waste Heat,2.7
Maritime,Useful Energy,1.2
Maritime,Waste Heat,1.9

Accepts CSV, TSV, Excel (.xlsx) — auto-detects format

✦Style

Flow Style

Rounded Corners

Smooth corner transitions

Custom Mode

Drag nodes to adjust layout

✋Custom Mode Active

Drag nodes on the canvas to reposition them.

Proportional Widths

Flow thickness by value

Node Border

Stroke outline on nodes

Max Thickness

50px

⌂Layout

Alignment

Node Sizing

Node Width

20px

Spacing

30px

AaTypography

Font Family

Font Size

14px

Label Position

Node Name Wrap

Off

Label Color

Flow Labels

Show values on flows

Position

Content

Font

Size

12px

✥Drag labels along flow to reposition

✎Annotations

Title

Title Font

Title Size

48px

Subtitle Size

22px

Wrap Width

730px

\u2725Drag title & subtitle independently on canvas

Text Annotations

Legend

Show Legend

Layout

Font Size

15px

Overall Scale

100%

Constrain to Canvas

Show Border

Text Wrap

4 chars

\u2725Drag legend on canvas to reposition

◐Colors

Palette

Preview

Flow Color By

Enter data to start

Paste CSV data, upload an Excel file, or try an example from the Data panel.

No Visualization

Enter data in the sidebar or click an example to get started.