Turn ideas into clean UML.
Add classes, members, and relationships, or let AI draft the diagram from plain text. Preview updates instantly and export a crisp SVG or PNG.
Why use this class diagram generator
AI-powered modeling with precise UML controls.
AI-first modeling
Describe your domain in plain text and get a complete UML class diagram to refine in seconds.
Smart relationships
Pick inheritance, composition, aggregation, association, dependency, or realization and add labels with cardinality like 1..* or 0..1.
Stereotypes & visibility
Mark interfaces and abstract classes; control member visibility (public, private, protected, package).
Auto layout & spacing
Clean arrangement that reduces line crossings and improves readability automatically.
Clear labels & titles
Editable chart title and concise class, member, and relationship labels for instant clarity.
Zoom and font control
Zoom and pan the canvas and adjust font size for presentations or detailed reviews.
Bring your data
Type classes
Enter class names, properties, methods, visibility, and types.
Paste text
Paste class definitions; AI maps classes, members, and links.
Describe with AI
Write a brief domain description; get a draft diagram to edit.
Start from sample
Begin with Animal, Duck, and Fish to learn the flow.
Share and export
Download SVG/PNG
Export sharp diagrams for slides and docs.
Share link
Send a view link to teammates or clients.
Embed on websites
Insert an auto-updating embed in your page.
Collaborate async
Collect feedback without sending files.
About this Class Diagram Tool
Make clean UML class diagrams without wrestling with layout. Describe your model, and AI drafts it instantly. Edit members, stereotypes, and relationships with simple controls. Preview as you go and export in high quality.
- ✓Built for fast UML modeling
- ✓AI that respects UML notation
- ✓Clear labels and cardinality
- ✓Auto layout with minimal crossings
- ✓Easy export, share, and embed
Quick facts
How it works
From idea to UML in minutes.
Describe or start blank
Type what you need or begin from an empty canvas to add classes manually.
Example: "Animal has name:String; Duck inherits Animal; Fish composition Fin 1..*."
Define classes
Add class names, stereotypes, and members with types, return types, and visibility.
Animal {+name:String, +eat():void}; Duck {+quack():void} <<interface>>.
Add relationships
Choose relationship types and label them with roles or cardinalities.
Duck —|> Animal (Inheritance); Fish —♦ Fin (1..* Composition).
Preview and export
Adjust title and font size, then export as SVG/PNG or share a link/embed.
Title: "Aquatic Domain Model"; Font size: 14.
Who it’s for
Purpose-built for modeling structures and behavior contracts.
Design domain models
Sketch core entities, interfaces, and inheritance to align teams before coding.
Teach UML quickly
Show class, member, and relationship basics with clear visuals and simple edits.
Contract-first design
Model service interfaces, DTOs, and dependencies to guide implementation.
Document systems
Capture current-state and target-state structures for stakeholder reviews.
Why this beats manual drawing
Less busywork, more clarity.
Traditional tools
- ✗Manual box-and-line drawing takes time
- ✗Tedious alignment and spacing
- ✗Hard to keep notation consistent
- ✗Frequent redraws after scope changes
- ✗Export and sharing feel clunky
AI-powered approach
- ✓Describe in text to generate diagrams fast
- ✓Auto layout with neat spacing
- ✓Consistent UML stereotypes and visibility
- ✓Edit once; updates ripple across the diagram
- ✓Instant SVG/PNG export and easy share/embed
Class diagram generator FAQs
What is a class diagram?
A class diagram is a UML diagram that shows classes, their members, and the relationships between them. It’s ideal for modeling domain structures, interfaces, and inheritance.
How does the AI class diagram generator work?
Describe your domain in plain language or paste class definitions. The AI creates classes, members, stereotypes, and relationships, then arranges them for readability so you can fine-tune in the editor.
Which relationship types are supported?
Use inheritance, composition, aggregation, association, dependency, and realization. You can also add simple links or dashed links, plus labels and cardinality like 1, 0..1, or 1..*.
Can I set stereotypes, visibility, and method details?
Yes. Mark classes as interface, abstract, enumeration, or service. Control member visibility (public, private, protected, package), set return types, and flags like static or abstract.
Can this class diagram generator export my work?
Yes. Download high-quality SVG or PNG for slides and docs. You can also share a link or embed the diagram on a webpage.
Accessible by design
- ✓Readable fonts with adjustable size
- ✓Zoom and pan for low‑vision users
- ✓High-contrast lines and shapes for clarity
- ✓Semantic line styles to distinguish relationship types
- ✓Keyboard-friendly editing basics
Privacy and control
- •Your diagrams are private until you share a link
- •You decide what to export or embed
- •Delete your work at any time
- •We don’t sell your data
- •File uploads are optional
Create your class diagram now
Describe your model and get a ready-to-edit UML in seconds.