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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
UUID
email
VARCHAR
name
VARCHAR
Posts
id
UUID
FKuser_id
UUID
title
VARCHAR
content
TEXT
Mini 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

  1. Start from scratch by clicking 'Add New Table' or use the AI panel to generate a starter schema.
  2. Customize your tables by adding columns, defining data types (INT, VARCHAR, etc.), and setting Primary/Foreign keys.
  3. Connect tables by dragging from one table's handle to another to create relationships (1:1, 1:N, N:M).
  4. Color-code your tables to organize modules visually.
  5. 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.

An ER Diagram Maker is an essential tool for anyone involved in database design, planning, or documentation. Whether you’re a student learning about relational databases or a professional architect building complex systems, a reliable ER diagram tool simplifies the visualization of entities, relationships, and attributes.

With the intuitive interface of the ER Diagram Maker at Toolsnak ER Diagram Maker, creating clear and structured entity-relationship diagrams becomes fast and efficient.

This ER Diagram Maker stands out due to its user-friendly design and powerful features that support both beginners and advanced users. You don’t need to install bulky software or learn complicated commands.

Instead, you can start building diagrams immediately in your browser, linking tables and defining relationships with simple drag-and-drop actions. It helps you ensure accuracy in your database models, reduce design errors, and communicate complex structures to team members or stakeholders.

Using Toolsnak ER Diagram Maker also means access to flexible export options, easy editing, and responsive support. The tool supports a variety of diagram formats to help you integrate your designs seamlessly with other documentation or development workflows.

Whether you’re working on academic projects or enterprise databases, this ER Diagram Maker is a reliable choice for creating professional, clear, and functional ER diagrams.

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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.

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