Free Object Diagram Generator
Create UML object diagrams with our free tool. Show instances and their relationships at runtime.
- Object instance notation
- Attribute value display
- Link relationships between objects
- Class type specification
- Named and anonymous objects
- Export as PNG, SVG, or code
Frequently Asked Questions
How are object diagrams different from class diagrams?
Class diagrams show structure (classes, attributes, methods). Object diagrams show instances with actual values at a specific point in time. Both use UML notation.
When should I use object diagrams?
Use them to illustrate complex scenarios, show examples for documentation, visualize test data, or debug object relationships. They make abstract classes concrete.
Can I show anonymous objects?
Yes! Objects without names (just :ClassName) represent instances where specific identity doesn't matter, only the type and values.