Full UML Class Support
Define classes with public, private, protected, and package visibility. Add attributes, methods, return types, and static or abstract modifiers to match standard UML notation precisely.
Chart & Visualization Tools
Class Diagram Maker
Define classes, add attributes and methods, then connect them with inheritance, composition, and association relationships. Your class diagram renders instantly as you build.
Features
Everything You Need in a Class Diagram Maker
Purpose-built for UML class modeling — from simple hierarchies to complex architectures
8 Relationship Types
Model inheritance, composition, aggregation, association, dependency, realization, link, and dashed link — covering every standard UML class relationship type.
Stereotypes for Precision
Mark classes as interface, abstract, enumeration, or service stereotypes so your diagrams communicate design intent at a glance.
Cardinality Labels
Annotate relationship lines with cardinality values (1, 0..1, 1..*, *) so multiplicity is always explicit and unambiguous in every class diagram.
AI-Powered Generation
Describe your system in plain English and the AI builds the class diagram — complete with classes, members, and relationships — ready to customize.
Zoom and Pan Navigation
Explore large class diagrams with smooth zoom and pan controls, keeping every detail readable even in complex multi-class designs.
Data input
Build Your Class Model Your Way
Type It In
Add classes, define attributes and methods, and set visibility modifiers directly in the editor.
Describe with AI
Tell the AI your system and it generates a full class diagram with classes, members, and relationships automatically.
Paste and Refine
Paste your class list or requirements and let the tool structure your UML diagram for you.
Upload Data File
Import structured data from CSV or Excel files to scaffold your class diagram quickly (Pro).
Share
Share Your Class Diagrams Anywhere
Export PNG or SVG
Download crisp, high-resolution class diagrams for documents, slide decks, and technical specifications.
Share via Link
Generate a shareable link so teammates and reviewers can view your class diagram instantly.
Embed in Your Site
Add an interactive class diagram to your documentation or wiki with a simple embed code (Plus).
Drop Into Any Doc
Export and paste your class diagram into Notion, Confluence, Figma, or any documentation tool.
About This Class Diagram Maker
MakeCharts provides a free, browser-based class diagram maker built for developers, students, and architects. Create UML class diagrams with a clean visual editor, AI generation, and instant export — no installation or prior UML experience required.
<2 minTime to first diagram
8 typesRelationship types
5 typesStereotype options
4 levelsVisibility levels
NoneSign-up required
Workflow
How to Create a Class Diagram
Add Your Classes
Click 'Add Class' to create a new class box. Enter the class name, choose an optional stereotype such as interface or abstract, then add attributes and methods with their types and visibility modifiers.
Define Relationships
Use the Relationships panel to connect classes. Select the relationship type — inheritance, composition, aggregation, association, or others — then set an optional label and cardinality value.
Customize and Export
Set a chart title and adjust font size in Chart Settings. Enable zoom and pan for large diagrams. Then download as PNG or SVG, share a link, or embed the diagram directly in your docs.
Use cases
Who Uses This Class Diagram Maker
Object-Oriented Design
Plan and communicate class structures before writing code. Map inheritance hierarchies, define interfaces, and clarify responsibilities between classes early in the development cycle.
Teaching OOP Concepts
Create clear visual examples of object-oriented principles for lectures, assignments, and study materials. Students can build and submit class diagrams as part of software design coursework.
Architecture Documentation
Document the structural design of systems and services so engineering teams, new hires, and stakeholders all share the same mental model of how components relate.
API and SDK Documentation
Include class diagrams in developer documentation and SDK guides to show how classes, interfaces, and enumerations relate — making it far easier for developers to understand and adopt your API.
Templates
Start with professionally designed templates
Classroom Management System Class Diagram Templateclassdiagram
Ready-to-use UML class diagram template for classroom management systems. Map teachers, students, courses, grades, and attendance visually. Free to edit.
Data Classification Framework Class Diagram TemplateclassdiagramVisualize your data classification framework with a UML class diagram. Map assets, access policies, retention rules, and audit trails in one view.
Object Oriented Design Template: UML Class DiagramclassdiagramFree OOP class diagram template with inheritance, interfaces, and relationships for a library management system. Customize and export instantly.
UML Class Diagram TemplateclassdiagramDesign clear UML class diagrams with this ready-to-use template. Visualize classes, attributes, methods, and relationships instantly. Free to use online.
Inheritance Hierarchy Class Diagram TemplateclassdiagramVisualize OOP inheritance with this UML class diagram template. Map abstract classes, subclasses, and overridden methods in minutes. Free and ready to use.
Related Tools
Create similar charts with these tools
Class Diagram Generatorclassdiagram
Generate UML class diagrams in seconds with AI. Add classes, members, stereotypes, and relationships from plain text. Free with SVG and PNG export.
Generate Class Diagrams FastclassdiagramGenerate a class diagram from source code with AI. Detect classes, members, and relationships; customize a classdiagram. Free: edit, zoom, export.
UML Class Diagram MakerclassdiagramDesign clean UML class diagrams online with our UML class diagram maker—free and AI‑powered. Add classes, members, stereotypes, relationships. Customize, zoom, and export or embed fast.
Domain Model Diagram MakerclassdiagramBuild domain model diagrams instantly with AI. Define classes, members, and relationships visually. Export as PNG or SVG for docs, presentations, and more.
Comparison
Class Diagram Maker vs. Traditional Diagramming Tools
Why developers and architects choose MakeCharts for UML class diagrams
MakeCharts Class Diagram Maker
- Describe your system and AI generates the diagram instantly
- Intuitive editor — no prior UML tool experience required
- Free tier covers full class diagram creation and export
- 8 relationship types with cardinality labels built in
- Edit classes and relationships in seconds as your design evolves
- Share via link, PNG, SVG, or embed code
Traditional Tools
- Hours spent dragging boxes and drawing arrows manually
- Steep learning curve for dedicated UML software
- Expensive licenses for enterprise diagramming tools
- No AI assistance — every class and member entered by hand
- Painful to update when the design changes mid-project
- Export options locked behind costly paid tiers
FAQ
Class Diagram Maker — Frequently Asked Questions
What is a class diagram?
A class diagram is a UML (Unified Modeling Language) structural diagram that shows the classes in a system, their attributes and methods, and the relationships between them. It is the foundation of object-oriented design and is widely used in software engineering to plan, document, and communicate system architecture.
Is this class diagram maker free?
Yes — creating and exporting class diagrams is free with no sign-up required. Free accounts also include limited AI credits to try AI-powered class diagram generation. Paid plans unlock more AI credits, SVG exports, embed codes, and file upload.
Can I generate a class diagram from a text description?
Yes. Use the AI-powered input to describe your system in plain English — for example, 'An e-commerce system with Product, Cart, Order, and User classes.' The AI generates a complete class diagram with classes, attributes, methods, and relationships. You can then edit and refine it as needed.
What relationship types does the class diagram tool support?
The tool supports all standard UML class diagram relationships: inheritance, composition, aggregation, association, dependency, realization, link, and dashed link. Each relationship supports an optional label and cardinality value such as 1, 0..1, 1..*, or *.
Can I add interfaces and abstract classes?
Yes. Each class supports stereotypes including interface, abstract, enumeration, and service. Individual members can be marked as abstract or static, and visibility can be set to public, private, protected, or package for each attribute and method.
How do I export my class diagram?
Download your class diagram as a PNG or SVG from the export menu. SVG export is available on paid plans and produces a scalable image ideal for documentation and presentations. You can also generate a shareable link or an embed code for your website.
Is this class diagram maker good for learning UML?
Absolutely. The editor is a practical way to learn UML notation hands-on. You can experiment with different relationship types, try stereotypes, and see how cardinality annotations work — all in an interactive visual editor. The AI generation feature also helps you see realistic examples quickly.
Can I use this class diagram maker for database design?
Class diagrams are frequently used to model database entities and their relationships, especially in object-relational mapping contexts. Represent tables as classes, columns as attributes, and foreign-key relationships as associations with cardinality to communicate your data model clearly.
How many classes can I add to a single diagram?
There is no hard limit on the number of classes in a single diagram. For large diagrams, the zoom and pan feature lets you navigate and inspect every detail without losing readability.
Do I need to install anything to use the class diagram maker?
No installation required. The class diagram maker runs entirely in your browser. Open the tool, start building, and export — no downloads, plug-ins, or account registration needed to get started.
Built for Every Team
- Works for students, developers, architects, and technical writers
- No UML experience required — the editor guides you step by step
- Accessible on any device, from desktop workstations to tablets
- Supports 12+ languages across the full application interface
- Free tier covers full functionality with no time limit
- Designed for solo creators and collaborative teams alike
Your Diagrams Stay Yours
- Your class diagram data is used only to render your diagram
- We do not sell or share your data with third parties
- Diagrams are private by default — you control what is shared
- Download or delete your work at any time
- No tracking of individual diagram content for advertising purposes
Start now
Start Your Class Diagram Now
Free, no sign-up required. Your first class diagram is minutes away.
- All 8 UML relationship types included
- AI-powered diagram generation
- Export as PNG or SVG
- No installation or sign-up needed
- Zoom and pan for complex diagrams
- Share via link or embed
Try: 'E-commerce order system with Product, Cart, and Order classes'