Professional Online UML Diagram Maker

ProcessOn is a professional UML diagram tool that supports sequence diagrams, use case diagrams, class diagrams, state diagrams, and many other UML diagrams. It is easy and efficient to use, friendly for beginners, and offers a large number of high-quality UML templates.

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Common UML Diagram Types

Behavior Diagrams

Behavior diagrams include use case diagrams, class diagrams, object diagrams, component diagrams, and deployment diagrams

Structure Diagrams

Structure diagrams include sequence diagrams, collaboration diagrams, state diagrams, and activity diagrams

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Rich UML Diagram Library

The system contains hundreds of UML diagram symbols, 26 theme styles, and supports custom page and diagram styles, allowing you to quickly draw various professional UML diagrams.

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ProcessOn Offers Stronger Collaboration Capabilities

Online Collaboration

UML online diagramming is simple and convenient, supports multi-person collaboration, allows setting share links, and real-time information transmission.

Compatible with Multiple Formats

UML diagrams support exporting to PNG, VISIO, PDF, SVG formats, and importing VISIO format files

Cloud Storage

UML files are stored in real-time, synchronized across different terminals, version history traceable, and file security is guaranteed.

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How to Create UML Diagrams

Directly create a new UML diagram or create a flowchart first, then add the UML diagram library to the workspace

Drag diagrams, elements, and symbols from the UML diagram library to the workspace and use them directly

Label the content by adding text descriptions to each diagram and element to indicate their identity

Styling: Use 'Match Size' under 'Size Matching' to make the diagrams the same size, and 'Align Distribution' to align the diagrams evenly.

Create relationships using lines, arrows, and other symbols to indicate the relationships between the diagrams

In this way, you have created a professional UML diagram, which you can publish to the ProcessOn template community or share for collaboration with colleagues and friends.

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Common UML Diagram Problems

How to Add the UML Diagram Library

Click 'More Diagrams' on the left of the workspace, select the UML diagram symbols, and click 'Confirm', then you can see them in the left drawing area.

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How to Change UML Diagram Styles

Click 'Style' on the left of the workspace, ProcessOn offers 26 styles, supporting one-click modification of the overall color scheme.

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How to Change Diagram Arrangements

Select two or more diagrams at the same time and use the button next to 'More' on the top toolbar to change the arrangement, distribution alignment, size matching, and grouping.

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How to Change UML Diagram Page Styles

Click 'Page Style' in the upper right corner to set, supporting canvas, grid, and watermark modifications.

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How to Add UML Diagram Data Attributes

Click 'More' and 'Data Attributes' in the upper right corner, supporting setting data attributes, data types, and attribute values.

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How to One-Click Style UML Diagrams

Click the 'Style' button in the upper left corner to style diagrams and lines with one click, making them more beautiful and neat.

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How to Restore Previous Versions of UML Diagrams

ProcessOn automatically saves version history to the cloud. Click 'File' - 'Version History' in the upper left corner, select the version to restore, and confirm the restoration.

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Why Choose ProcessOn

ProcessOn

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Support for creating various types of diagrams, no need to switch between multiple software

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Real-time collaboration, what you see is what you get, unified format, collaboration without barriers

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Historical files are automatically saved, restore to any desired version at any time

Traditional Drawing

Single drawing capability, need to purchase multiple software products

Inconsistent formats, low collaboration efficiency, files are passed back and forth, poor timeliness

Difficult version management, old versions are hard to find