AI from source code
Generate class diagrams directly from your codebase to accelerate documentation and reviews.
Chart & Visualization Tools
Generate Class Diagrams Fast
Paste code or describe your model and get a ready UML class diagram. Edit classes, members, and relationships with plain‑language controls and instant preview.
Features
Why this class diagram tool
AI reverse‑engineering plus precise manual control.
Class & member editing
Rename classes, set stereotypes, and edit attributes/methods with visibility, static, and abstract flags.
Relationship builder
Add inheritance, composition, aggregation, association, dependency, and realization with labels and cardinality.
Readable layout
Use a clear title and legible font size. Zoom and pan to explore large models without clutter.
Stereotypes & interfaces
Highlight interfaces, abstract classes, enumerations, and services so intent is obvious at a glance.
Export ready
Share a link or export crisp SVG/PNG for design docs, code reviews, and architecture diagrams.
Data input
Bring your code
Paste Source Code
Reverse‑engineer classes and relationships from Java, C#, Python, or TypeScript.
Describe Structure
Type a brief description; AI drafts classes, members, and stereotypes.
Start From Template
Load sample classes (Animal, Duck, Fish) to try features fast.
Manual Add
Create classes and links by hand for full control.
Share
Share and export
Share Link
Send a viewable link to teammates or clients.
Export SVG/PNG
Download crisp images for docs, slides, and repos.
Embed on Site
Add a live, up‑to‑date diagram to your wiki or page.
Version Friendly
Re‑generate and update exports without redrawing.
About this Class Diagram Tool
MakeCharts turns your source code into clear UML class diagrams. Generate a draft with AI, refine details with simple controls, and export in seconds. It’s fast, accurate, and easy to learn. Ideal for engineers, architects, educators, and consultants.
<2 minTime to first diagram
8Relationship types
4+Supported languages
YesFree to try
Workflow
How it works
Generate from Code
Let AI analyze your source to detect classes, members, and relationships for a draft UML.
Refine Structure
Use the Class Editor to rename, set stereotypes, and edit members with visibility, static, and abstract.
Define Relationships
Add inheritance, composition, aggregation, association, dependency, or realization. Label connections and set cardinality.
Preview & Export
Add a chart title, adjust font size, enable zoom/pan, then export SVG/PNG or share a link.
Use cases
Who it’s for
Reverse‑Engineer UML from Code
Turn Java, C#, Python, or TypeScript projects into class diagrams for onboarding, refactoring, and reviews.
Model Systems and APIs
Clarify domain models, service contracts, and integrations with concrete classes, interfaces, and relationships.
Teach OOP and UML
Show real examples of inheritance, composition, and interfaces from classroom code or assignments.
Document Codebases Quickly
Create clear diagrams for due diligence, modernization plans, and client deliverables without manual redraws.
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.
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.
Class Diagram MakerclassdiagramBuild UML class diagrams instantly. Define classes, members, and relationships visually — no coding needed. Free class diagram maker powered by AI.
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
Why choose AI over manual
Less clicking, more clarity.
AI‑powered with MakeCharts
- Generate from source code in seconds
- Keeps structure accurate with fewer clicks
- Edit in plain language with instant preview
- Infer precise relationships and cardinalities
- Export/share quickly without layout headaches
Traditional UML tools
- Manual drawing and formatting take hours
- Hard to keep diagrams in sync with code
- Complex menus slow down simple edits
- Limited or inconsistent language parsing
- Crowded layouts need constant fixes
FAQ
Class diagram FAQs
How do I generate a class diagram from source code?
Click Generate from code, paste or point to the relevant classes, and the AI drafts your UML. It detects classes, members, and likely relationships. You can then refine stereotypes, visibility, and cardinalities before exporting.
Can it generate a UML class diagram from Java, Python, or C#?
Yes. The generator is tuned for common OOP languages like Java, C#, Python, and TypeScript. It maps classes, interfaces, abstract types, methods, properties, and common relationships to a clean diagram.
Which relationships are supported?
You can add inheritance, composition, aggregation, association, dependency, realization, plus simple links (solid or dashed). Each connection can include a label and optional cardinality such as 1, 0..1, 1..*, or *.
How do I show interfaces, stereotypes, and abstract classes?
Use the Class Editor to set the stereotype (interface, abstract, enumeration, service) or none. Abstract and static flags are supported on members. The diagram renders these choices clearly so roles are unmistakable.
Can I edit visibility and methods after generation?
Absolutely. Update attributes and methods with public, private, protected, or package visibility. You can also set return types, toggle method/member static or abstract, and rename items inline.
How accurate is AI reverse engineering from code?
AI provides a strong first draft by detecting common patterns and relationships. Complex or meta‑programmed code may need light edits. Use the Relationship and Class editors to confirm intent and add labels or cardinalities.
Can I customize layout, title, font size, and interaction?
Yes. Add a chart title, adjust font size for readability, and enable zoom/pan to navigate large models. These settings help you present complex structures clearly.
How do I export or embed the diagram?
Export crisp SVG or PNG for documents and slides, or share a secure link for quick reviews. Embedding lets you place a live diagram on wikis or internal pages.
Is there a free version?
Yes. You can generate, edit, and export without paying. Upgrade later to save versions or unlock advanced conveniences if you need them.
Does this support the keyword intent to generate class diagram from source code?
Yes. The tool is designed to generate class diagrams directly from source code, then let you refine classes, members, stereotypes, and relationships with instant preview and exports.
Inclusive by design
- Keyboard‑friendly editing and navigation
- Readable fonts and scalable zoom for low‑vision users
- Color choices with strong contrast by default
- Clear text labels on classes and relationships
- Exports that preserve text for screen readers in SVG
Your privacy matters
- You control what you share—keep diagrams private or send a link
- Code is only used to generate your diagram for this session
- You can delete diagrams and exports anytime
- We never sell your data or diagrams
- Exports are created on demand and not publicly listed
Start now
Turn Code into UML Now
Get a clean class diagram in seconds—free.
- AI reverse‑engineering from code
- Edit classes, members, and stereotypes
- Set relationship labels and cardinalities
- Zoom, pan, and adjust font size
- Export crisp SVG/PNG or share a link
Works with Java, C#, Python, TypeScript