Create Sankey charts and alluvial diagrams directly in your browser — no installation, no account, no cost. Paste your CSV data and get a polished flow diagram in seconds with six styles and high-resolution export.
Any dataset with a source, target, and value can be turned into a Sankey diagram.
Visualize electricity generation, transmission losses, fuel consumption, and renewable energy flows across entire grids or single facilities.
Map where your money comes from and where it goes. Budget breakdowns, revenue streams, salary allocation, and cash flow — visualized as a money flow diagram.
Track material flows from raw inputs through processing and distribution to final products. Identify inefficiencies and bottlenecks at a glance.
Quantify greenhouse gas emissions, carbon flows, water usage, or waste streams across processes, industries, and supply chains.
Visualize conversion funnels, drop-off points, and traffic sources. See exactly how users move through websites, apps, or sales pipelines — step by step.
Present data flows, experimental results, or system analyses in publications and presentations with publication-quality SVG exports.
A full-featured Sankey diagram tool that runs entirely in your browser.
No learning curve. Your first diagram takes under a minute.
Each row defines one flow. Three columns: where the flow starts, where it ends, and how much. That's all. Tab-separated and Excel files are also accepted.
Optional fourth column for a custom label. Headers are auto-detected and skipped.
Common questions about Sankey diagrams and this tool.
A Sankey diagram is a type of flow chart where the width of each arrow or band is proportional to the quantity it represents. Originally used to visualize steam engine efficiency, they are now widely used for energy audits, financial reporting, environmental assessments, and any situation where quantities flow between nodes.
Enter your data as comma-separated values with three columns: Source, Target, and Value. Each row represents one flow — for example "Solar,Grid,450". The tool builds the diagram instantly. You can then drag nodes, change colors, switch flow styles, and export when ready.
Completely free, no account required. There are no watermarks on exports, no usage limits, and no ads within the tool. Just open the page and start creating.
PNG at up to 4× resolution for presentations and documents, and SVG vector format for lossless scaling and further editing in tools like Illustrator, Figma, or Inkscape. You can also save the full project as a .sankey file and reload it later.
Most online Sankey tools are basic — limited styles, no drag-and-drop, fixed layouts. This tool offers an infinite canvas, six flow rendering styles, smart crossing optimization, per-node color overrides, flow labels, annotations, a project save system, and high-quality SVG export. It is designed for researchers, engineers, and analysts who need more control.
Yes — energy flows are one of the most common use cases. Whether you are mapping national energy consumption, building energy audits, power grid flows, or fuel chain analysis, the proportional flow widths make quantities immediately comparable.
Free, browser-based, and ready in seconds.
Built by Haider Niaz. Free for everyone — researchers, engineers, students, and analysts.