Online Class Diagram Tool

Visualize UML Modeling with Online Class Diagrams

Quickly design and share class diagrams online to model system structures and relationships. Use Collaborate on your diagrams for efficient and accurate UML modeling.

Create a Class Diagram

Extensive UML shape library for fast class diagram design
Collaborate in real time on class diagrams with teammates
Version-controlled, secure sharing for reliable diagram access

Over 10 Million people and 1000s of teams already use Creately

Diagramming

Visual Collaboration

Org Chart

Used by Over 10 Million people and 1000s of teams

A Comprehensive Tool for Visual Collaboration and Diagramming

it is ease of collaborative diagramming and real-time editing. This allows teams to brainstorm, create, and refine diagrams together in a way that feels intuitive and seamless, regardless of location.

JUAN LEONARDO G

Small-Business

Efficient and User-Friendly Diagramming Tool

I love how easy it is to create and collaborate on diagrams with Creately. The real-time collaboration feature is incredibly helpful for team projects, and the extensive library of templates and shapes saves a lot of time

Aymen G

Small-Business

Creately provides best diagram structure.

Creately has proven to be an incredibly creative tool, enhancing the visual appeal of our company tasks significantly. Additionally, its pricing is highly competitive, offering great value for the features it provides.

Ruchika N

Assistant Manager

Creately: Simple Diagram Tool

I like that Creately is easy to use. It helps me create diagrams quickly and easily.

Ananya G

Executive Committee Member

Creately: A smart choice for expressing ideas over diagrams

Creately is a simple and user-friendly application for creating diagrams to visualize complex technical ideas and data flow on wireframes, flow charts, and other visual options. The best part of this tool is its real-time collaboration features, which help us to enhance the workflows in the team.

Gulam M

Software Engineer

User friendly and visually appealing!!

The interface is easy to use. The look is aesthetically pleasing as well. Love the functionality.

Chrisoula

Small-Business

Intuitive Design and Effortless Creativity

What I like best about Creately is its intuitive design and the ease with which it allows me to create attractive designs. From the moment I started using it, I was impressed by how easy it was to navigate the platform and how quickly I could bring my ideas to life in visually appealing diagrams and charts.

DARWIN M.

Mid-Market

Creatly Awesome App

In creatly easy to use and easy to design our all network diagrams for the clients and easy to export and Creately offers a user-friendly interface that makes it easy for users to create various types of diagrams without extensive training or experience. We used creately on daily basis for making diagram.

Surya Prakash M

Tech Lead Security

Easy to use

Creately has better options than Canva. It has great templates. it is a great product to use for visual org charts.

Jennifer D.

Initial Implementation

Great AI features

AI Modelling capability. It gives Prompt examples so user can learn how to create effective prompts

Karma A.

Business Manager

IDEATE & VISUALIZE

Brainstorm and Design Class Diagrams with Ease

Image of Creately's Class Diagram Tool with the Shapes Panel

Use Creately’s intuitive class diagram maker with drag-and-drop shapes and a comprehensive UML shape library to quickly bring ideas to life.
Visualize classes, objects, attributes, and relationships on an infinite canvas for clear system modeling.
Leverage sticky notes, templates, and formatting options to simplify complex diagramming workflows.
Multi-perspective modeling with adaptive shapes that adjust according to your project context.
Fast diagram creation with reusable templates and intuitive diagramming tools designed for class diagram creators and software designers.

Image of Creately's Class Diagram Tool with the Version History

ANALYZE & STRATEGIZE

Centralize and Track Your Class Diagram Projects

Keep all your class diagram online projects organized with centralized documentation for easy reference and access.
Maintain accuracy and workflow integrity with built-in version control that tracks changes and updates automatically.
Quickly compare diagram iterations and restore previous versions to ensure consistency across your designs.
Streamline system analysis and strategy planning with clear, accessible UML documentation.
Collaborate confidently knowing that every update is tracked and your diagrams remain structured and error-free.

CONNECT & ORGANIZE

Link, Annotate, and Centralize Your Class Diagrams

Image of Creately's Class Diagram Tool with the Notes Panel

Add context to your class diagram online with a flexible notes panel for annotations and reminders.
Enrich diagrams by embedding links, images, and multimedia to provide additional references and resources.
Keep all project information in one place with centralized documentation, making system modeling and design easy to manage.
Organize complex class diagrams visually, ensuring clarity and easy navigation across large projects.
Streamline collaboration by keeping all related content and notes connected to your diagrams in real time.

Image of Users Collaborating in Creately's Class Diagram Tool

COLLABORATE

Work Seamlessly with Your Team in Real Time

Collaborate seamlessly with multiple cursors and @mentions to keep everyone on the same page.
Add contextual comments directly on your class diagram online for clear, actionable feedback.
Share diagrams securely with access control to manage who can view or edit your projects.
Export your class diagrams in SVG, PNG, JPEG, or PDF formats for easy sharing and presentation.
Ensure smooth teamwork and accurate diagram updates while keeping your UML models organized and protected.

Ideate, plan, and execute ideas better with Creately

Create a Class Diagram Book a Demo

A class diagram is a type of UML diagram used to visually represent the structure of a system. It shows classes, their attributes, methods, and the relationships between them, helping developers, analysts, and designers understand, organize, and plan software systems. Using an online class diagram tool like Creately allows you to create, edit, and share professional class diagrams efficiently, making system modeling faster and easier.

How to Create a Class Diagram Online in Creately

Launch Creately

Sign in to your account and open a new workspace. Start from scratch or select a ready-made class diagram template to save time.

Add Shapes and Connectors

Use Creately’s drag-and-drop shape library to add classes, attributes, methods, and relationships. Connect elements effortlessly to visualize system structure.

Customize and Organize

Arrange your diagram with sticky notes, the notes panel, and formatting tools. Add annotations and context to keep your class diagram clear and well-structured.

Collaborate in Real Time

Invite teammates to edit simultaneously using multiple cursors, @mentions, and contextual comments. Share ideas and updates instantly.

Review, Update & Share

Finalize your diagram, make updates as needed, and share securely. Export your class diagram as SVG, PNG, JPEG, or PDF for easy distribution.

Create a UML Deployment Diagram

Start Modeling Systems with These Free Class Diagram Templates

ServiceNow Class Diagram

Edit Diagram

Warehouse Class Diagram

Edit Diagram

ERP ( Class Diagram)

Edit Diagram

UBER Class Diagram

Edit Diagram

FAQs About Online Class Diagram Tool

What is the best tool for creating UML Class Diagrams?

Creately is the best online class diagram tool for professionals and teams. Trusted by developers, analysts, and designers worldwide, it combines an intuitive drag-and-drop interface, ready-made templates, and collaboration features to make creating class diagrams fast and accurate. Most professionals who use Creately and recommend it for efficient UML modeling and system visualization.

Is Creately’s Class Diagram Tool Free?

Yes! Creately offers free access with core features, including templates, shapes, and basic diagramming tools. For full access to advanced features such as real-time collaboration, version control, and unlimited exports, you can upgrade to a premium account.

Can I export my class diagrams without losing quality?

Absolutely. Creately allows you to export class diagrams as SVG, PNG, JPEG, or PDF. SVG exports are especially powerful because they’re vector-based, meaning you can scale diagrams up for print or shrink them for the web without any pixelation or quality loss. This ensures your diagrams remain crisp and professional in any format.

What is the main purpose of class diagrams?

The main purpose of a class diagram is to visually represent the structure of a software system. It shows classes, their attributes and methods, and the relationships between them, helping developers, analysts, and designers understand, organize, and plan the system efficiently. Using an online class diagram tool like Creately makes it easy to create, edit, and share these diagrams for clearer system modeling and effective communication.

Why are class diagrams important in software development?

Class diagrams are important because they provide a clear visual representation of a system’s structure. They help teams understand object-oriented designs, define relationships between classes, and plan software architecture efficiently. With Creately’s online class diagram tool, you can create accurate, professional diagrams quickly, collaborate in real time, and ensure your designs are easy to communicate and maintain.

Streamline Your Workflows by Integrating with the Tools You Love

Creately integrates with the tools your teams use every day and supports your team’s workflow seamlessly.