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Free ER Diagram Generator
Design professional Entity Relationship Diagrams (ERD) for your databases instantly with our AI-powered visual tool.
100%
Select an element
Select a table or relationship to edit properties
AI Generate
Users
id
UUIDemail
VARCHARname
VARCHARPosts
id
UUIDFKuser_id
UUIDtitle
VARCHARcontent
TEXTMini map
100%
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What is an ER Diagram?
An Entity Relationship (ER) Diagram is a visual representation of the structure of a database. It illustrates how entities (such as users, orders, or products) relate to each other within a system. ER diagrams are essential for database design, helping developers and stakeholders understand the data organization before implementation.
Why Use Toolsnak's ER Diagram Maker?
Our tool simplifies database modeling with a clean, drag-and-drop interface and powerful AI features.
- 100% Free & Online: No software installation or credit card required.
- AI-Powered Generation: Describe your project in plain English, and our AI will build the schema for you instantly.
- Visual Design: Easily add tables, define columns (PK/FK), and draw relationships.
- Privacy Focused: Your diagrams are processed locally in your browser.
- Multi-Format Export: Download your work as JSON (to edit later), SVG (for high-quality printing), or PNG.
How to Create an ER Diagram
- Start from scratch by clicking 'Add New Table' or use the AI panel to generate a starter schema.
- Customize your tables by adding columns, defining data types (INT, VARCHAR, etc.), and setting Primary/Foreign keys.
- Connect tables by dragging from one table's handle to another to create relationships (1:1, 1:N, N:M).
- Color-code your tables to organize modules visually.
- Click 'Download' to save your diagram as an image or project file.
Ideal For
- Software Developers designing new applications.
- Students learning database concepts and SQL.
- Product Managers visualizing data requirements.
- Data Analysts understanding legacy systems.
Got Questions? We have you covered
Yes, Toolsnak's ER Diagram Maker is completely free to use. There are no hidden fees, subscriptions, or login requirements.
Simply type a description of your application (e.g., 'Library management system with books, members, and loans') into the AI panel. Our intelligent engine will generate the relevant tables, columns, and relationships for you automatically.
Currently, we support exporting to JSON, SVG, and PNG. We are working on adding direct SQL script generation in a future update.
No signup is required. You can save your work by downloading the JSON file, which you can upload later to continue editing. The tool also autosaves to your browser's local storage.
We support all standard entity relationships: One-to-One (1:1), One-to-Many (1:N), and Many-to-Many (N:M). You can easily toggle between these in the property panel.
Yes. Your diagrams are created and stored within your browser session. We do not store your database schemas on our servers.
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