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Data Flow Diagram Maker
Build a data flow diagram to show how data moves between processes, stores, and external entities. Adapt the starter labels, then export for analysis docs.
Features
- Live editor for data flow diagram maker
- Starter template included on the page
- PNG and SVG export
- No install required
Need a blank canvas? Open the full UML studio.
What you can model
Data flow diagrams (DFDs) focus on movement of data, not control logic inside a UI. They help analysts and engineers agree on inputs, stores, and outputs.
How to use this maker
Place external entities, processes, and stores, label flows with data names, avoid unlabeled arrows, preview, then export.
Notation that matters
External entities send or receive data. Processes transform data. Stores hold data at rest. Every arrow should name the data that moves, not only the fact that a link exists.
Keep the diagram readable
Use a flowchart for step order and decisions. Use an ER diagram for table structure. Keep each DFD at one level of detail so readers are not lost in nested explosions on a single page.
Frequently asked questions
Is this data flow diagram maker free?
Yes. Create and export online without a subscription.
DFD or flowchart?
Use a flowchart for step order and decisions. Use a DFD when the question is what data moves where.
DFD or ER diagram?
DFDs show movement of data. ER diagrams show stored structure and keys.
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Browse the full UML diagram tools directory or return to the UML diagram hub.