Free Class Diagram Templates

Illustrate software systems structure with Creately's Class Diagram templates. Create detailed and accurate Class Diagrams to represent software architecture. Simplify system design and documentation with editable Class Diagrams.
Templates

How to Use the Class Diagram Templates in Creately

  • Choose a template that suits your needs

    Choose a UML class diagram template for your system. Click “Edit This Template” to open it and add your classes.

  • Sign in or create a free Creately account

    Create a free account or sign in. This lets you save your class diagram, return to it later, and keep every change synced to your workspace.

  • Open the template and customize it

    Add classes with their attributes and methods, then connect them with associations, inheritance and other UML relationships.

    • Add class boxes with attributes and operations
    • Set visibility (+ public, - private, # protected)
    • Draw associations, aggregation and composition
    • Show inheritance/generalization between classes
    • Add multiplicity to relationships
  • UML relationship notation

    The library includes correct UML connectors—generalization, aggregation, composition, dependency—so your class model is unambiguous to developers.

  • Collaborate with your team

    Share for feedback. Give others view or edit access to your class diagram, gather comments inline, and resolve them without leaving the canvas.

  • Save, export, or present

    Finish and share. Save to your workspace, export the class diagram as PNG, JPEG, SVG or PDF, or present it live — then embed or link it wherever your team works.

FAQs about Class Diagram Templates

Are the class diagram templates free?

Yes. Most class diagram templates are free to open and edit with a basic Creately account — browse the collection, pick one, and start customizing right away. A few advanced templates or features sit on paid plans, but the free tier is plenty to get started.

Can I export these templates to Word, PowerPoint or other tools?

Yes. Export your class diagram from Creately as PNG, JPEG, PDF or SVG and drop it into Word, PowerPoint, Google Docs, Slides, Confluence or any tool that accepts images — handy for reports, decks and handouts.

What can class diagrams model?

Class diagrams describe system structure:

  • Domain models - core classes and their relationships
  • Object-oriented designs - attributes, methods, visibility
  • Inheritance hierarchies - shared and specialized behavior
  • Associations - how classes reference each other
  • System blueprints - a static view before coding
What’s the difference between aggregation and composition?

Both show a whole-part relationship; composition is stronger—the part can’t exist without the whole (filled diamond), while aggregation is a looser grouping (hollow diamond). The templates include both connectors.