erd diagram tool

August 03, 2026

General

ERDPlus is a free, web-based tool to create Entity-Relationship Diagrams (ERDs), Relational Schemas, and Star Schemas, and to generate SQL — all in your browser, no installation required. Create ER diagrams, aka entity relationship diagrams, and other database schema diagrams online using our ERD diagram tool. ERD stands for entity relationship diagram. People also call these types of diagrams ER diagrams and Entity Relationship Models. An ERD visualizes the relationships between entities like people, things, or concepts in a database. An ERD will also often visualize the attributes of these entities. Learn Entity Relationship Diagram (ERD). Read this ERD guide for everything you need to know about data modeling and database design with ERD. Entity relationship diagrams (ERD), or ER models, show the logical structure of databases and highlight the interrelations between specific concepts, or entities, (i.e. objects, people, places, etc.) in a given topic area. For related background details, please refer to our report on th400 valve body diagram. XDA Developers on MSN: This tool replaced every diagramming app I've ever used What are the main components of an ERD? The main components of an ERD include entities (represented as rectangles), relationships (depicted as diamonds), and attributes (shown as ovals), which together illustrate the structure of the database. ER diagrams represent the E-R model in a database, making them easy to convert into relations (tables). These diagrams serve the purpose of real-world modeling of objects which makes them intently useful. Unlike technical schemas, ER diagrams require no technical knowledge of the underlying DBMS used. As a visual thinker, I love a good diagram, especially mind maps and flowcharts. They allowed me to gain an overview of all the details, draw connections, summarize information, and identify problems.

As a visual thinker, I love a good diagram, especially mind maps and flowcharts. They allowed me to gain an overview of all the details, draw connections, summarize information, and identify problems.