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Free AI ER Diagram Generator — Entity Relationship Database Schemas | Paperxify

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FlowchartSequence DiagramClass DiagramState DiagramER DiagramUser JourneyPie ChartQuadrant ChartTimelineSankey DiagramXY ChartBlock Diagram

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Database Schema & ER Diagram Engine

AI-Powered ER Diagram Generator for Database Schema Design

Designing a relational database without a clear ER diagram is asking for architectural debt. Paperxify's AI ER Diagram Generator reads your data model description — entities, their attributes, primary keys, foreign keys, and relationships — and generates a complete entity-relationship diagram with proper cardinality notation (one-to-many, many-to-many) in seconds.

PK / FK Notation

Primary keys and foreign keys are automatically identified and annotated with PK/FK labels in the diagram.

Cardinality Relationships

One-to-one, one-to-many, and many-to-many relationships rendered with correct crow's foot or UML notation.

Highly Rated
"Generated our entire e-commerce database ER diagram from a written spec in under 30 seconds. PKs, FKs, and cardinality were all correctly mapped. Weeks of DB design work visualized instantly."
UK
James Sterling
Economics Student, LSE, UK

Capabilities Comparison

Why engineers, students, and researchers globally choose Paperxify for AI diagram generation.

CapabilitiesPaperxify AI DiagramsDraw.io / LucidchartManual Diagramming
AI from Data Model Description Yes (Instant)Manual drawingManual drawing
PK / FK Auto-Annotation Yes (Automatic)Manual labelsManual
Cardinality Notation Yes (One-to-many / Many-to-many)ManualManual
SQL to ER Reverse Engineering Yes (Paste SQL schema)Some tools (Paid)Manual analysis

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Frequently
asked questions

The Best Free AI ER Diagram Generator

Describe your database entities and relationships, or paste your SQL schema. Get a complete ER diagram with PKs, FKs, and cardinality in seconds.

Generate ER Diagram Now