Class Diagram Template
Design your object-oriented architecture with classes, attributes, methods, and relationships. Perfect for backend design and code reviews.
Use this templateWhat you get
- Class boxes with attributes and methods
- Inheritance, composition, and association arrows
- Visibility modifiers (+/-/#) for members
What this template is for
A UML class diagram template gives you a ready-made structure for designing and documenting object-oriented systems. This template shows classes with attributes and methods, inheritance hierarchies, associations, and dependency relationships — the core building blocks you need before writing a single line of code. Use it in backend design sessions, code reviews, or when onboarding new engineers to an unfamiliar codebase.
When to use this template
- Design a new domain model before starting a sprint so engineers share a common understanding of the data structure.
- Document an existing codebase for a new team member who needs to understand the architecture quickly.
- Review a proposed design change in a code review by visualizing what changes before approving a PR.
- Communicate a database schema design to non-technical stakeholders using a class diagram instead of raw SQL.
- Detect coupling and circular dependencies visually before they become production problems.
How to use it
- 1Identify the main entities in your domain — each becomes a class box with a name, attribute list, and method list.
- 2Add attributes with their types and visibility modifiers: + (public), - (private), # (protected).
- 3List the key methods with their signatures and return types.
- 4Draw inheritance arrows (solid line with hollow arrowhead) from child classes to parent classes.
- 5Add association lines between classes that reference each other, with multiplicity labels (1, 0..*, 1..*).
- 6Use dependency arrows (dashed lines) for weaker, usage-based relationships.
Quick example
E-commerce order system
User { id, email, +login(), +logout() }
↑ inherits
AdminUser { +banUser(), +viewReports() }
Order { id, status, createdAt, +confirm(), +cancel() }
1 ── * OrderItem { quantity, price }
* ── 1 Product { name, sku, stock }
Order * ── 1 User
Start editing online
Open the template in CodePic, replace the sample nodes, and turn it into your own study board in a few minutes.
See examples: /templates/class-diagram/examples
