Need a free online UML class diagram software?

Introducing Visual Paradigm Online Free Edition, a free online diagramming software that offers both basic and advanced UML diagramming functionalities. The UML class diagram editor enables you to create professional system design blueprints with UML. The UML diagram examples enable you to get started in quick. As a web-based UML tool, VP Online runs on the web and is compatible with all browsers.

Make a Class Diagram

Professional class diagram starts here

Free UML Software

Draw as many class diagrams as you like. Output your work as images (PNG/JPG/GIF/SVG) or PDF. Enjoy!

No limited number of diagrams and shapes
No limited period of access
No advertisement

Draw Easily and Smartly

Online drawing can be easy and fun. Here are some of the editing features included in our intuitive class diagram editor:

Drag-to-create shape
Well attached connectors (no separate apart)
Instant copying of shape format
Save shapes as pattern for reusability
Hundreds of diagram templates

Better Results

An array of powerful diagram tools are there to support you in creating stunning class diagrams:

Precise shape positioning with alignment guide
Insert your own image, URL and text
Range of shape and line format options
Rotatable shapes and captions
Group, align and distribute shapes
Auto shape formation from item list

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.