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Free Class Diagram Software

Draw Class Diagrams and other UML diagrams with a free, online diagram tool

Need a web-based class diagram editor for free?

Visual Paradigm Online Free Edition is available for creating beautiful UML Diagrams. As a web-based UML class diagram tool, it supports Windows, Mac OS, and Linux. The UML software features an intuitive interface that supports fast shape creation with drag-and-drop and alignment guide. Although it's free, you can create unlimited diagrams and output diagrams into images. Try now! No registration required.

Free Class Diagram Software
Make a Class Diagram

Diagram with a top-rated class diagram software

Absolutely Free

Create as many diagrams as you like. Output diagrams into images (PNG/JPG/GIF/SVG) or PDF. Simply free!

  • No limited number of diagrams and shapes
  • Non-restricted accessing period
  • No banner / advertisement

Simple & Quick Diagram

Create professional class diagrams with our intuitive online UML tool. Some of the editing features:

  • Drag to create and connect shapes
  • Well attached connectors (no separate apart)
  • Replicate shape format in one click
  • Reuse shapes in diagrams
  • Hundreds of diagram examples & templates

Feature-Rich

A range of powerful diagramming tools are there to support you in producing great class diagrams:

  • Alignment guide: Position shapes accurately
  • Embed your own image, URL and text
  • Shape and line formatting options
  • Rotatable shapes and text
  • Group, align and distribute shapes
  • Auto. create shape from item list

Key features and benefits

Key features and benefits
  • Unlimited period of access
  • Unlimited number of diagrams
  • Unlimited number of shapes
  • UML Diagram Tool, ERD Tool, Organization Chart Maker, Floor Plan Designer, ITIL, Business Concept Diagram
  • Can be upgraded to paid editions for more diagram types and features
  • Cross-platform: Windows, Mac, Linux. Compatible with all web browsers
  • Easy to use: Create and connect shapes with drag and drop. Connectors will snap to shapes and never separate apart.
  • Apply different formatting options (shape and lines, solid and gradient paint), 40+ connector types, RTF caption, font options, shadow effect, etc
  • Visio drawing and stencil import
  • Draw your own diagrams with your own shapes.
  • Easily embed text, external images and web links to diagram
  • Get start quickly with hundreds of diagram examples and diagram templates
  • Print, export and share your work in different formats (PNG, JPG, SVG, GIF, PDF)
  • Google Drive Integration

But don't take our word for it

Try it yourself. Just browse the Class Diagram examples below and click Open Diagram to open and edit. You will see for yourself that it is everything we say it is, or perhaps more.

Class Diagram Example: Sales Order System

Open Diagram

Class Diagram Example: Sales Order SystemOpen Diagram

Class Diagram Example: Car

Open Diagram

Class Diagram Example: CarOpen Diagram

Class Diagram Example: Telephone

Open Diagram

Class Diagram Example: TelephoneOpen Diagram

Class Diagram Example: Star-Based LAN

Open Diagram

Class Diagram Example: Star-Based LANOpen Diagram

Other Solutions

Start Drawing Your Free Diagram Today

No limitations, no obligations, no cancellation fees.


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