Flow Diagram Maker
Visualize any flow from source to destination in seconds.
Create professional Sankey diagrams that show exactly how resources, energy, or data move through your system. Proportional flow widths make the story unmistakable at a glance.
Everything You Need in a Flow Diagram Maker
Purpose-built controls for Sankey diagrams — not generic chart settings.
Proportional Flow Widths
Link widths automatically scale to reflect flow values, making dominant paths immediately visible without any manual adjustment.
Custom Node Colors
Assign distinct colors to each node or use gradient flows to trace paths visually from source to destination.
AI-Powered Generation
Describe your flow in plain language and the AI builds a complete Sankey diagram with nodes, links, and values ready to refine.
Flexible Node Editor
Add, remove, rename, and recolor nodes on the fly — the diagram updates live so you always see the full picture.
Label and Value Control
Toggle node labels and flow values on or off, and adjust font sizes to keep diagrams clean at any complexity level.
Instant Export
Download your flow diagram as a high-quality PNG or SVG in one click — no watermarks, no waiting.
Bring Your Flow Data In Any Format
Type It Directly
Define nodes and link values manually using the simple flow editor — no spreadsheet needed.
Paste From Spreadsheet
Copy source-target-value rows from Excel or Google Sheets and paste them straight into the tool.
Upload CSV or Excel
Import structured flow data files directly for instant Sankey diagram generation (Pro).
Describe It to AI
Tell the AI what flows you want to visualize and get a ready-made Sankey diagram in seconds.
Share Your Sankey Diagram Anywhere
Download as PNG or SVG
Export crisp, high-resolution images ready for reports, slides, and publications.
Share via Link
Generate a shareable URL so teammates or clients can view your flow diagram instantly.
Embed on Your Site
Add a live Sankey diagram to any webpage with a single embed code snippet (Plus and above).
Add to Presentations
Drop the downloaded image straight into PowerPoint, Google Slides, or Keynote.
About This Flow Diagram Maker
MakeCharts built this Sankey flow diagram tool so anyone can turn complex flow data into a clear visual in minutes. No coding. No design tools. No manual calculations. Just your data and a finished diagram ready to share.
- ✓Powered by MakeCharts — trusted for 50+ chart types across business, education, and content
- ✓Sankey-specific controls built for flow data, not adapted from generic chart editors
- ✓AI generation trained to produce logical, readable flow structures
- ✓Free for individuals; scalable plans for teams and power users
- ✓Continuously improved based on real user feedback and use cases
Flow Diagrams That Speak for Themselves
Build a Flow Diagram in 3 Steps
From raw flow data to a polished Sankey diagram — faster than a spreadsheet.
Define Your Nodes
Add the categories or stages in your flow — sources, processes, and outputs. Name each node to match your data story.
Nodes: 'Revenue', 'COGS', 'Gross Profit', 'Operating Expenses', 'Net Income'
Connect Flows With Values
Link nodes with directional flows and assign a numeric value to each. The diagram automatically sizes link widths proportionally.
Revenue → COGS: 420,000 | Revenue → Gross Profit: 580,000
Customize and Export
Adjust colors, labels, spacing, and animation speed. Then download your Sankey flow diagram or share it via link.
Export as SVG for a pitch deck or embed on your dashboard
Where Sankey Flow Diagrams Excel
Any time resources split, combine, or transform — a Sankey diagram tells the story.
Energy Flow and Loss Analysis
Map how input energy converts and dissipates across a system to pinpoint inefficiencies. Sankey diagrams are the industry standard for energy audits and sustainability reporting.
Budget and Revenue Flow Visualization
Show how money moves through an organization — from top-line revenue down to net profit — so stakeholders grasp the full financial picture instantly.
User Journey and Traffic Funnels
Visualize where users enter, navigate, and drop off across your product or website to identify conversion bottlenecks at a glance.
Material and Resource Flows
Track raw materials through manufacturing stages to finished goods, making supply chain complexity understandable for any audience.
Templates
Start with professionally designed templates
Flow Diagram Maker vs. Manual Diagramming
See why teams switch from traditional tools to AI-powered Sankey creation.
Manual Tools (Visio, Draw.io)
- ✗Hours spent sizing and aligning flow links by hand
- ✗Values and widths must be calculated and drawn manually
- ✗Updating data means rebuilding the whole diagram
- ✗No AI to suggest structure or generate from a description
- ✗Steep learning curve for non-designers
- ✗Export formats limited or behind paywalls
MakeCharts Flow Diagram Maker
- ✓Proportional flow widths calculated and drawn automatically
- ✓Describe your flow in plain language and get a diagram instantly
- ✓Edit any value and the diagram updates live
- ✓AI generates a complete Sankey from a single sentence
- ✓Intuitive node and link editor — no design skills needed
- ✓Free PNG and SVG export with no watermarks
Frequently Asked Questions
What is a flow diagram maker?
A flow diagram maker is an online tool that helps you create visual diagrams showing how quantities move between categories or stages. Our flow diagram maker specializes in Sankey charts, where link widths represent the magnitude of each flow — making proportions immediately visible.
What is a Sankey diagram and when should I use one?
A Sankey diagram is a type of flow chart where the width of each arrow or link is proportional to the flow quantity it represents. Use it whenever you need to show how a total quantity — energy, money, traffic, or material — splits and recombines across a system. It is especially powerful for revealing where the largest losses or transfers occur.
Is this flow chart maker really free?
Yes. You can create, customize, and download Sankey flow diagrams at no cost with no sign-up required. Free accounts also include AI credits so you can try AI-powered diagram generation. Paid plans unlock more AI usage, file uploads, and embed codes.
Can I make a flow chart with multiple levels?
Absolutely. Our Sankey diagram tool supports multi-stage flows where the same node can receive flows from one layer and send flows to the next. This is ideal for complex systems like supply chains, budget waterfalls, or multi-step user journeys.
How do I create a Sankey diagram from my data?
Add your nodes (categories) using the node editor, then define links by selecting a source node, a target node, and a flow value. The diagram renders instantly. You can also paste data from a spreadsheet or use the AI to generate a starting diagram from a plain-language description.
Built for Everyone Who Works With Flows
- ✓No design background needed — the tool handles proportions and layout automatically
- ✓Works equally well for simple 3-node flows and complex multi-stage systems
- ✓Available in 12+ languages so your whole team can use it
- ✓Fully functional on desktop, tablet, and mobile
- ✓Free tier has no feature gating — all chart controls are accessible without a subscription
- ✓AI generation lowers the barrier for users unfamiliar with Sankey diagram conventions
Your Flow Data Stays Yours
- •Your diagram data is used only to render your chart — it is not shared with third parties
- •You control what you download, share, or publish
- •No data is sold or used for advertising
- •You can delete your account and associated data at any time
- •Shared links only expose what you explicitly choose to share
Ready to Map Your First Flow?
Create a polished Sankey flow diagram in under two minutes — free, no sign-up needed.