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.
Chart & Visualization Tools
Data Warehouse Schema Generator
Describe your data model and our AI generates a complete entity-relationship diagram — entities, keys, cardinalities, and relationships included. No SQL required.
Features
Everything You Need to Design Data Warehouse Schemas
Purpose-built ERD features that map your warehouse structure clearly and accurately.
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.
Data input
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
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.
<2 minSchema generated in
10k+ERDs created
50+Chart types available
12+Languages supported
NoneSign-up required
Workflow
How to Generate a Data Warehouse Schema ERD
Describe Your Data Warehouse
Type or paste a description of your warehouse — fact tables, dimension tables, grain, and key business entities — in plain language.
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.
Refine and Customize
Add or remove entities, rename attributes, adjust cardinalities, and switch layout direction until the schema is exactly right.
Export and Share
Download your ERD as PNG or SVG, share a direct link with your team, or embed it in your data documentation.
Use cases
Who Uses This Data Warehouse Schema Generator
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
E-commerce Order Management ERD Templateerd
Visualize your E-commerce Order Management ER Diagram fast. See entities, keys, and flows from cart to delivery—share, embed, and refine in minutes.
Online Store Products & Inventory ERD TemplateerdDesign a clean Online Store Products and Inventory ERD fast. Map products, stock, orders, and suppliers to prevent stockouts and speed decisions.
Shopping Cart & Checkout ERD Template for E‑commerceerdBuild a clear Shopping Cart and Checkout Entity Relationship Diagram in minutes—align teams, reduce defects, and ship a scalable data model.
SaaS User-Team-Subscription erd Template for Clean Data ModelserdVisualize a User, Team, and Subscription SaaS ER Diagram in minutes. Map ownership, memberships, and billing with a clean, customizable model.
Multi-Tenant SaaS Database ERD TemplateerdDesign a secure, scalable SaaS schema in minutes. Map tenants, users, roles, and billing with this Multi-Tenant SaaS Database ERD Template.
CRM Contacts–Leads–Deals ERD: a clear, scalable modelerdDesign a clean CRM Contacts, Leads, and Deals ER Diagram in minutes. Clarify relationships, prevent duplicates, and speed up implementation.
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AI ERD Diagram GeneratorerdDesign clean ER diagrams fast. Our database schema diagram tool uses AI to map entities, PK/FK keys, and cardinality. Free to start, customize layout, and export.
Comparison
AI ERD Generator vs. Manual Schema Design
See why data teams switch from manual diagramming to AI-powered schema generation.
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
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
FAQ
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.
Can I edit the ERD after it is generated?
Yes. The configuration panel lets you add or delete entities, rename attributes, change attribute types, reassign key designations, and modify relationship cardinalities. You can also switch the layout direction and adjust font size so the diagram fits your documentation format.
What cardinality notations are supported in the ERD generator?
The generator supports exactly-one, zero-or-one, one-or-more, and zero-or-more cardinality on each side of a relationship. You can also choose between identifying and non-identifying relationship types, which is critical for modeling dependent entities and surrogate key relationships in a warehouse schema.
How do I export or share my data warehouse ERD?
Once your schema is ready, download it as a high-resolution PNG or SVG image for use in docs and slides. You can also share a direct link with teammates or embed the diagram into documentation tools like Confluence or Notion using the provided embed code.
Is this data warehouse schema generator free to use?
Yes. MakeCharts offers a free plan with no sign-up required. You can create, customize, and download ERDs at no cost. AI-powered schema generation uses credits that are included free with every account, and paid plans provide additional credits for larger or more complex warehouse projects.
What makes MakeCharts different from other ER diagram tools?
Most ER diagram tools require manual drag-and-drop setup that takes hours. MakeCharts combines an AI generator that produces a complete ERD from your description with a visual editor for refinement, all in one browser-based tool. There is no software to install, no long learning curve, and sharing is instant via link or embed.
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
Start now
Generate Your Data Warehouse ERD Now
Describe your schema and get a professional entity-relationship diagram in under two minutes.
- No sign-up required
- AI-powered ERD generation
- PK, FK, and cardinality support
- Export as PNG or SVG
- Share via link or embed
- Free forever plan available
Free to use. No sign-up required to get started.