Data Warehouse Schema Generator
Design your data warehouse schema as a clear, professional ERD in minutes.
Describe your data model and our AI generates a complete entity-relationship diagram — entities, keys, cardinalities, and relationships included. No SQL required.
Everything You Need to Design Data Warehouse Schemas
Purpose-built ERD features that map your warehouse structure clearly and accurately.
AI Schema Generation
Describe your data warehouse in plain English and get a fully annotated ERD with entities, attributes, PKs, FKs, and cardinalities generated automatically.
Key Type Notation
Assign PK, FK, UK, and composite key types to any attribute so your schema accurately reflects real database constraints at a glance.
Cardinality Controls
Set exactly-one, zero-or-one, one-or-more, or zero-or-more cardinality on every relationship with clear, standard ERD notation.
Identifying Relationships
Distinguish between identifying and non-identifying relationships to precisely model fact tables, dimension tables, and bridge entities in your warehouse.
Flexible Layout Directions
Orient your ERD top-to-bottom, left-to-right, or any direction to match your warehouse topology and stakeholder documentation format.
Zoom, Pan, and Export
Navigate large warehouse schemas with smooth zoom and pan controls, then export a crisp image in one click.
Build Your Schema Your Way
Type Your Model
Describe your data warehouse in plain language and the AI maps it to a structured ERD instantly.
Paste Table Definitions
Paste SQL CREATE TABLE statements or column lists and watch them transform into a visual schema.
Upload a File
Import CSV or Excel files with your table structure to auto-generate entity blocks and relationships.
Edit Visually
Add entities, define attributes, assign PKs and FKs, and set cardinalities directly in the diagram editor.
Share and Export Your ERD
Download PNG or SVG
Export your data warehouse ERD as a high-resolution image ready for docs, slides, and presentations.
Share a Link
Generate a shareable URL so teammates, DBAs, and stakeholders can review the schema without an account.
Embed in Docs
Drop your ERD into Confluence, Notion, or any website using a simple embed code.
Collect Team Feedback
Share the diagram with your data engineering team to review relationships and catch design issues early.
About the Data Warehouse Schema Generator
MakeCharts built this tool for data engineers and architects who need to document, design, and share warehouse schemas fast. Describe your model, get a clean ERD, and move straight to building. No diagramming background required.
- ✓AI generates complete ERDs with entities, keys, and relationships from plain-language input
- ✓Full attribute editor with PK, FK, UK, and composite key support
- ✓Cardinality and relationship type controls for accurate warehouse modeling
- ✓One-click export as PNG or SVG for docs, presentations, and data dictionaries
- ✓Free to use with no sign-up required
- ✓Part of MakeCharts' 50+ visualization tool suite
By the Numbers
How to Generate a Data Warehouse Schema ERD
From blank page to complete entity-relationship diagram in three simple steps.
Describe Your Data Warehouse
Type or paste a description of your warehouse — fact tables, dimension tables, grain, and key business entities — in plain language.
e.g. 'Sales DW with CUSTOMER, PRODUCT, DATE, and SALES_FACT tables linked by surrogate keys'
Review the Generated ERD
The AI produces a complete ERD with entity blocks, attribute types, key designations, cardinality markers, and relationship labels ready to inspect.
SALES_FACT connects to CUSTOMER and PRODUCT via FK relationships with one-to-many cardinality
Refine and Customize
Add or remove entities, rename attributes, adjust cardinalities, and switch layout direction until the schema is exactly right.
Add a DATE_DIM entity, mark date_key as PK, and link it to SALES_FACT with a non-identifying relationship
Export and Share
Download your ERD as PNG or SVG, share a direct link with your team, or embed it in your data documentation.
Attach the ERD to your Confluence data dictionary or include it in a Jira data modeling epic
Who Uses This Data Warehouse Schema Generator
From solo analysts to enterprise data teams — ERD diagrams speed up every stage of the warehouse lifecycle.
Model Fact and Dimension Tables
Data engineers use ERDs to map star and snowflake schemas before writing DDL, ensuring foreign key integrity and correct grain from the start.
Document the Semantic Layer
BI teams create ERDs to document how reports map to underlying warehouse tables, helping stakeholders understand the data model without reading SQL.
Plan and Review Database Designs
Database architects use ERD diagrams during design reviews to catch missing keys, incorrect cardinalities, and normalization issues before a migration begins.
Teach Data Modeling Concepts
Instructors and bootcamp teachers generate ERDs to demonstrate relational theory, warehouse patterns, and SQL join logic to students visually.
Templates
Start with professionally designed templates
Online Store Products & Inventory ERD Template
Visualize how products, categories, inventory, orders, customers, suppliers, and warehouses connect in one clear ERD.
Shopping Cart & Checkout ERD Template for E‑commerce
Visualizes users, carts, items, orders, payments, shipping, coupons, and inventory across the checkout lifecycle.
SaaS User-Team-Subscription erd Template for Clean Data Models
Visualizes Users, Teams, Memberships, and a single Team Subscription with clear PK/UK/FK keys, roles, and ownership.
Multi-Tenant SaaS Database ERD Template
Visualize tenants, organizations, users, roles, permissions, plans, subscriptions, and resources—covering shared vs. isolated tenancy models.
CRM Contacts–Leads–Deals ERD: a clear, scalable model
This erd visualizes how Companies, Contacts, Leads, and Deals relate, including the many-to-many link between Contacts and Deals via Deal_Contact.
E-commerce Order Management ERD Template
This template visualizes how customers, orders, items, payments, shipments, inventory, coupons, addresses, and returns connect across the order lifecycle.
View All Templates
Browse the full library to find more templates tailored to your chart.
AI ERD Generator vs. Manual Schema Design
See why data teams switch from manual diagramming to AI-powered schema generation.
Manual Diagramming
- ✗Hours spent placing and connecting entity boxes by hand
- ✗Easy to miss FK constraints or cardinality errors
- ✗Requires expensive diagramming tools with steep learning curves
- ✗Hard to iterate quickly when schema requirements change
- ✗Diagrams drift out of sync with the actual database structure
- ✗Sharing means exporting files and sending email attachments
MakeCharts ERD Generator
- ✓Complete data warehouse ERD generated from a plain-text description
- ✓AI auto-assigns PKs, FKs, and cardinality markers accurately
- ✓Free browser-based tool — no install, no license required
- ✓Update the diagram in seconds when requirements change
- ✓Always reflects your latest schema decisions in one place
- ✓Share via link or embed in docs in one click
Frequently Asked Questions
What is a data warehouse schema generator?
A data warehouse schema generator is a tool that helps you design and visualize the structure of a data warehouse as an entity-relationship diagram. You describe your tables and their relationships, and the tool creates a clear ERD showing entities, attributes, keys, and cardinalities. MakeCharts uses AI to generate the ERD automatically from a plain-language description.
What is an ERD and why does my data warehouse need one?
An ERD (entity-relationship diagram) is a visual map of the tables in your database and how they relate to each other. For a data warehouse, an ERD makes it easy to verify that fact tables are correctly linked to dimension tables, foreign keys are defined, and the grain of each table is understood. It serves as shared documentation for data engineers, BI developers, and business stakeholders.
Can I generate a star schema or snowflake schema ERD?
Yes. Describe a star schema with a central fact table connected to multiple dimension tables, or a snowflake schema where dimension tables are further normalized. The AI generates the corresponding ERD with correct one-to-many cardinalities, FK relationships, and entity attribute lists.
Does this tool support primary keys and foreign keys?
Absolutely. Each attribute in an entity can be assigned a key type: PK (primary key), FK (foreign key), UK (unique key), or a composite PK+FK. These designations are displayed clearly inside the entity block so any viewer understands the referential integrity constraints at a glance.
How do I create a free ERD for my database schema?
Open the Data Warehouse Schema Generator, type a description of your database or paste your table names and columns, then click 'Generate ERD Free.' The AI creates a complete entity-relationship diagram you can edit, download, and share — no account required to start.
Built for Every Data Team
- ✓Beginner-friendly — no SQL or UML certification required to create a professional ERD
- ✓Works on any device — design warehouse schemas on desktop, tablet, or mobile
- ✓Available in 12+ languages so international data teams can collaborate in their own language
- ✓Useful for solo analysts, early-stage startups, and large enterprise data engineering departments
- ✓Plain-language controls — no diagramming background needed to get polished results
Your Schema Data Stays Yours
- •Your table definitions and schema descriptions are used only to generate your diagram
- •We do not sell or share your data with third parties
- •You control what you export, share, or embed
- •Delete your account and associated data at any time
- •No persistent storage of sensitive database structure details beyond your session
Generate Your Data Warehouse ERD Now
Describe your schema and get a professional entity-relationship diagram in under two minutes.