AI-first modeling
Describe your domain in plain text and get a complete, ready-to-edit UML class diagram in seconds.
チャート・可視化ツール
Class Diagram Generator
Describe your domain model and AI builds a clean UML class diagram in seconds. Add stereotypes, visibility, and relationships, then export as SVG or PNG.
Features
Why use this class diagram generator
AI-powered UML modeling with precise, professional controls.
Smart relationships
Choose inheritance, composition, aggregation, association, dependency, or realization and label with cardinality like 1..* or 0..1.
Stereotypes and visibility
Mark classes as interface, abstract, enumeration, or service; set member visibility per field and method.
Auto layout
Diagrams are arranged automatically to minimize line crossings and keep your model readable.
Clear labels and titles
Editable chart title and concise class, member, and relationship labels for instant understanding.
Zoom and font control
Pan the canvas, zoom in for details, and adjust font size for presentations or deep code reviews.
Data input
Add your model
Type classes
Enter class names, members, types, visibility, and stereotypes directly into the editor.
Paste definitions
Paste existing class definitions and AI maps members and relationships for you.
Describe with AI
Write a short domain description and get a full draft diagram ready to refine.
Use a sample
Start from Animal, Duck, and Fish to learn the tool in under a minute.
Share
Share and export
Download SVG/PNG
Export crisp, high-resolution diagrams ready for slides and documentation.
Share a link
Send a view link to teammates or stakeholders with a single click.
Embed on any site
Add a live, auto-updating diagram embed directly to your webpage.
Async collaboration
Collect feedback on diagrams without sending large files back and forth.
About this class diagram tool
Skip the drag-and-drop grind. Describe your model in plain text and AI produces a clean, standards-compliant UML class diagram instantly. Edit members, stereotypes, and relationships with simple controls. Preview every change live and export in high quality.
<2 minAvg. setup time
8Relationship types
SVG, PNGExport formats
YesZoom & pan
YesFree to start
Workflow
How it works
Describe or start blank
Type what you need or open an empty canvas to build your class diagram manually.
Define classes and members
Add class names, stereotypes, and members with types, return types, and visibility modifiers.
Set relationships
Pick a relationship type and add optional labels or cardinalities between classes.
Export or share
Set your title, adjust font size, then download SVG/PNG or share a link and embed code.
Use cases
Who it's for
Design domain models
Sketch core entities, interfaces, and inheritance hierarchies to align teams before writing a single line of code.
Teach OOP and UML
Show class, member, and relationship basics with clear visuals that students can explore and edit themselves.
Contract-first API design
Model service interfaces, DTOs, and dependencies visually to guide implementation and keep contracts explicit.
Document system structure
Capture current-state and target-state class structures for stakeholder reviews and architecture decisions.
テンプレート
プロフェッショナルにデザインされたテンプレートから始める
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.
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Comparison
Why this beats manual drawing
Less busywork, more clarity.
AI-powered class diagram generator
- Describe in plain text and get a diagram in seconds
- Auto layout keeps spacing and alignment clean
- Consistent UML stereotypes and visibility throughout
- Edit once and the diagram updates automatically
- One-click SVG/PNG export and instant share link
Traditional diagramming tools
- Manual box-and-line drawing is slow and error-prone
- Constant re-alignment after every change
- Hard to keep UML notation consistent
- Full redraws required after scope changes
- Clunky export and file-sharing workflows
FAQ
Class diagram generator FAQs
What is a class diagram generator?
A class diagram generator is a tool that creates UML class diagrams from text input or visual editing. It handles layout, notation, and relationships automatically so you can focus on your model rather than drawing boxes and lines by hand.
What is a UML class diagram?
A UML class diagram shows classes, their properties and methods, and the relationships between them such as inheritance, composition, and association. It is the standard format for documenting object-oriented domain models and software architecture.
How does the AI class diagram generator work?
Describe your domain in plain language or paste class definitions. The AI identifies classes, members, stereotypes, and relationships, then arranges them into a clean, readable diagram. You can refine every detail in the editor afterward.
Which relationship types does the online class diagram maker support?
Inheritance, composition, aggregation, association, dependency, realization, link, and dashed link are all supported. Add labels and cardinalities such as 1, 0..1, or 1..* to any relationship to match your domain exactly.
Can I set stereotypes, visibility, and method signatures?
Yes. Mark any class as interface, abstract, enumeration, or service. Control member visibility with public, private, protected, or package. You can also set return types and flag members as static or abstract.
Can I export or share my class diagram?
Yes. Download as high-quality SVG or PNG for slides and documentation. You can also copy a share link to send to teammates or generate an embed code to display the diagram on any webpage.
Is this UML class diagram maker free?
Yes. You can create and export professional UML class diagrams for free with no sign-up required. Upgrade to a paid plan for more AI credits, CSV/Excel file uploads, and advanced automation.
Can I paste text to generate a class diagram?
Yes. Paste class definitions or a brief domain description. The AI maps names, members, stereotypes, and relationships into a ready-to-edit diagram automatically, saving you significant setup time.
Does the generator support interfaces and abstract classes?
Yes. Use the stereotype control to mark any class as an interface or abstract class. The auto layout keeps these roles visually distinct from concrete classes throughout the diagram.
Accessible by design
- Readable fonts with adjustable size controls
- Zoom and pan for users who need larger views
- High-contrast lines and shapes for visual clarity
- Distinct line styles to tell relationship types apart
- Keyboard-friendly controls for essential editing
Privacy and control
- Your diagrams are private until you share a link
- You choose what to export or embed
- Delete your work at any time
- We do not sell your data
- File uploads are optional and under your control
Start now
Create your class diagram now
Describe your model and get a ready-to-edit UML diagram in seconds.
- Natural language to UML
- Stereotypes and visibility controls
- All 8 UML relationship types
- Auto layout and spacing
- SVG/PNG export and easy sharing
Supports stereotypes, visibility, and cardinality. AI maps everything automatically.