Free ER Diagram Tool

Diagram conventions

Get started with our basic naming and shape conventions including entities, relationships, and attributes.

Cardinality constraints are easily conveyed through simple formatting of shapes and arrows.

Unlike other applications that tend to be overly complex, Lucidchart's ER diagram tool is made for human use.

Simply start a document and open the ER diagram library to begin dragging and dropping shapes.

And by instantly, we mean in real-time. No wondering which member of your team has the "working" copy.

Your documents are stored safely in the cloud and efficiently kept in sync across your team.

Win praises from your team for migrating to the cloud, saving money on individual Visio licenses, and enabling collaboration.

Say goodbye to your desk. Work virtually, anytime, anywhere, on any device that supports HTML5.