Professional Online ER Diagram Maker

The ER diagram, also known as the Entity-Relationship Diagram, is a graphical representation method commonly used in database design and information modeling. It is a data model or schema used to describe entities, attributes, and relationships in the real world. ProcessOn supports creating ER diagrams with various templates to easily draw professional E-R diagrams.

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Components of an ER Diagram

Entity

An entity represents objects or concepts in the real world, which can be tangible objects or abstract concepts. Entities are usually represented by rectangles with the entity name inside.

Relationship

A relationship represents the connection between entities, usually represented by a diamond shape with the relationship name inside and lines pointing to the related entities.

Attribute

An attribute describes the characteristics of an entity, usually represented by an oval or rounded rectangle, connected to the corresponding entity by a line.

Cardinality

Defines the numerical attributes of the relationship between two entities or entity sets, mainly existing in three relationships: one-to-one, one-to-many, and many-to-many.

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Quickly Create ER Diagrams

ProcessOn includes essential symbols and professional symbols for ER diagram drawing, as well as a rich library of user cases and content materials. With 26 built-in theme styles, you can quickly create professional and beautiful ER diagrams.

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ProcessOn ER Diagram Highlights

Online Collaboration

Creating ER diagrams online is simple and convenient, supporting multi-user collaboration and allowing for the setup of sharing links for real-time information transmission.

Compatible with Various Formats

ER diagrams support exporting to PNG, VISIO, PDF, SVG formats, and importing VISIO files.

Cloud Storage

ER diagram files are saved in real-time, synchronized across different terminals, with traceable version history and secure storage.

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How to Create an ER Diagram with ProcessOn

Create a new flowchart or canvas, select Entity-Relationship Diagram (E-R Diagram) symbols under 'More Shapes' and add them to the shape area.

Determine entities. Analyze all entities, drag the rectangle from the shape library to the editing area, and add a label.

Determine relationships. Identify the relationships between all entities, drag the diamond shape from the shape library to the editing area, draw lines between them to indicate the relationships, and label them.

Determine attributes. Add attributes to entities to describe them in detail, drag the oval from the shape library to the editing area, and draw lines to indicate the affiliation.

Determine relationship types. Identify whether the relationships are one-to-one, one-to-many, or many-to-many.

Style optimization: Use 'Resize' and 'Align and Distribute' functions to make the shapes consistent in size and neatly arranged.

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Common ER Diagram Issues

How to Add ER Shape Library

Click 'More Shapes' at the bottom of the shape area, select the Entity-Relationship Diagram (E-R Diagram), and click 'Confirm' to display the ER shapes in the shape area.

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How Can Beginners Quickly Create ER Diagrams

Visit the ProcessOn template community, find a suitable ER diagram template, clone it, and modify it according to the actual situation.

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How to Keep the ER Diagram Shapes Consistent in Size or Align Them

It is recommended to use the 'Align and Distribute' and 'Resize' functions. Select two or more shapes, choose from eight alignment options including left align, center align, and right align. The 'Resize' function allows matching width, height, or both.

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How to Restore Previous Versions of the ER Diagram

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

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How to Share and Collaborate on ER Diagrams

Click the 'Share and Collaborate' button in the upper right corner, enter the other user's account to invite them to collaborate, or enable public sharing and share the link for viewing.

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How to Publish ER Diagram Templates

Click the publish icon next to your avatar in the upper right corner to publish private files to the template community, set them for paid cloning, and earn revenue.

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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