Free Online Diagram Tool
Create flowcharts, mindmaps, UML, architecture and ER diagrams — right in your browser. No signup. 100% private.
Try It Now — Interactive Diagram Demo
The fully interactive diagram editor is live above. Pick a mode — Flowchart, Mindmap, UML, Architecture, or ER — then click nodes from the sidebar to build your diagram. Connect nodes with arrows, customize colors, and export as PNG, SVG, or JSON. No signup needed.
Diagram Examples
See what you can create with the Toolaska Diagram Tool — from quick flowcharts to detailed database schemas.
Process Flowcharts
Map out business processes, approval workflows, and decision trees with standard flowchart symbols.
Mindmaps
Brainstorm ideas, plan projects, and organize information hierarchically with radial topic maps.
UML Class Diagrams
Design object-oriented systems with classes, interfaces, inheritance, and composition relationships.
System Architecture
Visualize microservices, APIs, databases, queues, and cloud infrastructure in professional diagrams.
ER Diagrams
Model database schemas with entities, attributes, and relationship lines including cardinality markers.
User Flow Diagrams
Map user journeys, onboarding flows, and navigation paths for product design and UX planning.
Who Uses the Diagram Tool?
Built for developers, designers, students, and business teams who think visually.
Software Developers
- Design system architecture before coding
- Create UML class and sequence diagrams
- Model database ER schemas
- Plan API flows and microservices
Product Teams
- Map user flows and customer journeys
- Design process and approval workflows
- Create org charts and decision trees
- Plan feature roadmaps visually
Students & Educators
- Build mindmaps for revision and study
- Create flowcharts for algorithm assignments
- Design ER diagrams for database courses
- Visualize concepts and relationships
DevOps & Cloud Engineers
- Diagram cloud infrastructure (AWS, GCP, Azure)
- Map CI/CD pipelines and deployment flows
- Design network topologies
- Document infrastructure as diagrams
Business Analysts
- Visualize business process models
- Create BPMN-style workflow diagrams
- Map data flows between systems
- Document requirements visually
Designers & Creatives
- Sketch information architecture
- Create sitemap diagrams
- Design user interaction flows
- Storyboard application screens
How to Use the Diagram Tool — Complete Guide
Everything you need to create professional diagrams in minutes.
Choose a Diagram Mode
Click any mode tab — Flowchart, Mindmap, UML, Architecture, or ER Diagram — to load the relevant node palette in the left sidebar.
Add Nodes
Click any node card in the sidebar to insert it at the canvas center. Each mode provides specialized shapes — diamonds for decisions, ellipses for use cases, cylinders for databases, etc.
Connect Nodes
Select the Connect tool, click near an edge (top, bottom, left, right) of the source node, then click an edge on the target node. An arrow connector is drawn perfectly between those specific points. Connectors update dynamically when you move or rotate nodes.
Select & Edit
Use Select mode to drag, resize, and rotate any object. Double-click text labels to edit them inline. Use the Properties panel on the right to change fill color, stroke, and opacity.
Zoom & Pan
Scroll the mouse wheel to zoom in/out. Hold Space and drag to pan across the canvas. Use the zoom controls at the bottom-right to reset or adjust precisely.
Undo & Redo
Press Ctrl+Z to undo and Ctrl+Shift+Z to redo. Every node insertion, move, resize, and deletion is tracked in the history stack.
Export Your Diagram
Click PNG for a high-resolution image (2× pixel density), SVG for scalable vector output, or JSON to save the full project state for later import.
Auto-Save & Restore
Your diagram is automatically saved to browser storage after every change. When you return, your last session is restored automatically — no data loss.
Toolaska Diagram Tool vs Alternatives
How does Toolaska compare to popular diagram tools like Draw.io, Excalidraw, and Lucidchart?
| Feature | Toolaska Free | Draw.io | Excalidraw | Lucidchart |
|---|---|---|---|---|
| Price | Free — always | Free | Free & Open Source | Freemium (limited) |
| No signup needed | ||||
| Flowchart mode | Basic | |||
| Mindmap mode | Plugin | |||
| UML support | ||||
| ER diagrams | ||||
| 100% private | Partial | |||
| PNG + SVG export | Paid plan | |||
| Mobile support |
Frequently Asked Questions
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