Free Sankey Diagram Maker
Show where things flow and how much: add source, target, and value flows and the nodes arrange themselves into columns. Download a crisp PNG or SVG, no signup, no watermark.
| Source | Target | Value | |
|---|---|---|---|
What is a Sankey diagram?
A Sankey diagram shows flows between nodes, where each band's width is proportional to the amount flowing. It's the clearest way to visualize where things move, such as users through a funnel, money through a budget, or energy through a grid, from one stage to the next.
How to make a Sankey diagram
- 1Add your flows. Enter each flow as a source, target, and value. Nodes are matched by name, so reuse a name to connect flows through it.
- 2Let it lay out. Nodes are placed into columns automatically by flow direction, so you describe the flows and the layout falls out.
- 3Style the bands. Choose gradient bands that blend source to target, or flat source-colored bands, on a light or dark background.
- 4Download PNG or SVG. Click download for a high-resolution PNG or a crisp, scalable SVG. No watermark and no signup.
- 5Automate with the API (optional). Save it as an Imejis template and generate the same diagram from live data on every API call.
What is a Sankey diagram used for?
- User-journey and conversion-path flows
- Budget and spend allocation
- Traffic from source to page to outcome
- Energy and material flows
- Any quantity that splits and merges across stages
How this chart maker compares
| Feature | This tool | Chart-image APIs | Design makers |
|---|---|---|---|
| No-code visual editor | Yes | No, write JSON/URL config | Yes |
| Chord + 23 other chart types | Yes | Limited / plugins | Some types only |
| PNG and SVG export | Yes, free | Varies, often watermarked free | Often account-gated |
| No signup, no watermark | Yes | API key required | Account required |
| Matching image API | Yes | API only, no editor | No |
Bottom line: config-driven chart APIs make you hand-write JSON and live with dated defaults, and design makers gate exports behind an account. This tool gives you a live editor, beautiful output, free PNG and SVG, and the same chart on tap via API.
Generate Sankey diagrams automatically via API
Save your design as a template, mark the Sankey component dynamic, and render the same diagram with fresh data on every API call. It is the only Sankey tool with a matching image API.
See the Sankey component and API