Sankey Flow Diagram Maker | Free Online Tool

What is Sankey Flow Diagram Maker?

Convert Source, Target, and Value tables into nodes and weighted streamlines to produce scalable SVG previews. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

Enter the data according to the field prompts and select the required processing method.
Click "Process Now" to view the results, indicator summary and necessary error messages.
After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

Budget flow, energy, conversion funnel, supply chain, user journey and data flow. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

Negative values and circular flows require special layout strategies, and this tool focuses on non-negative flow data. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

Sankey Flow Diagram Maker supports current Chrome, Edge, Firefox, and Safari releases. Mobile and desktop layouts use the same validation rules documented on this page.

Frequently Asked Questions

Will Sankey flow diagram maker upload data to the server?

No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.

What usage scenarios is Sankey Flow Diagram Maker suitable for?

Budget flow, energy, conversion funnel, supply chain, user journey and data flow

Do I need to install software before using Sankey flow diagram maker?

No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.

What are the limitations of this tool?

Negative values and circular flows require special layout strategies, and this tool focuses on non-negative flow data.

Is manual inspection required after the results are generated?

Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.

Sankey Flow Diagram Maker: inputs, output, and reproducible example

Use the free Sankey Flow Diagram Maker online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

Field	Control	Default example	Validation role
chart width	Number	`840`	chart width is read by the browser as a number value before the tool runs.
chart height	Number	`420`	chart height is read by the browser as a number value before the tool runs.
flow data	Multiline text	`Visitors \| Signup \| 720 Visitors \| Leave \| 280 Signup \| Activate \| 510 Signup \| Dormant \| 210 Activate \| Paid \| 180 Activate \| Free \| 330`	flow data is read by the browser as a multiline text value before the tool runs.

Reproduce the built-in example

After validating chart width, chart height, flow data, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

Limits and checks before use

Page verification record

Controls inspected3 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02