SQL to Visual ERD Diagram Generator
Paste your MySQL, PostgreSQL, SQLite, or SQL Server `CREATE TABLE` statements below to instantly generate a clean, visual Entity-Relationship Diagram (ERD) detailing table structures, primary keys, foreign keys, and relational mapping.
Paste SQL CREATE TABLE statements on the left to render the visual database schema diagram.
Comprehensive Guide: Transforming Raw SQL Schemas into Visual Database ERDs
Relational database design is the bedrock of modern backend software engineering. Whether you are building an e-commerce platform, a SaaS web app, or an enterprise resource planning (ERP) suite, designing clean, normalized database tables with proper foreign key constraints is essential for data integrity and performance.
However, reading through hundreds of lines of text-based SQL DDL (`CREATE TABLE`) scripts to understand how tables relate to one another can be overwhelming. Development teams, database architects, and project managers need a visual representation — an Entity-Relationship Diagram (ERD).
The HiFi Toolkit SQL to ERD Generator eliminates the need for expensive commercial design software or tedious manual diagramming. Simply paste your SQL schema DDL commands into our editor, and watch as our browser-based engine automatically parses table entities, columns, datatypes, primary keys, and foreign key relationships into a clean visual schema block layout.
Why Visual ERD Diagrams are Essential for Developers
- Instant Codebase Onboarding: New developers joining a project can inspect the database structure in seconds instead of reading thousands of lines of SQL migrations.
- Detect Missing Foreign Keys: Visualizing table relationships immediately highlights orphaned tables or missing relational constraints before going into production.
- Architecture & System Design Reviews: Perfect for pasting into technical design documents, pull request descriptions, and architectural reviews.
- 100% Client-Side Data Security: Proprietary database schemas and table structures stay entirely inside your browser. No database code is transmitted to external servers.
Supported SQL Dialects & Features
Our parser handles standard ANSI SQL syntax as well as dialect-specific conventions across popular relational database management systems (RDBMS):
MySQL & MariaDB
Supports backtick identifiers (```table_name```), auto-increment primary keys, inline `FOREIGN KEY (...) REFERENCES ...`, and `ENGINE=InnoDB` clauses.
PostgreSQL
Parses double-quoted column names, `SERIAL` datatypes, `VARCHAR`, `TIMESTAMP WITH TIME ZONE`, and separate `ALTER TABLE ... ADD CONSTRAINT` foreign key references.
SQLite
Handles inline `PRIMARY KEY`, simple lightweight column type declarations (`TEXT`, `INTEGER`, `BLOB`, `REAL`), and embedded foreign key syntax.
Microsoft SQL Server & Oracle
Parses square bracket identifiers (`[dbo].[users]`), `IDENTITY(1,1)`, `NVARCHAR`, `DATETIME2`, and standard constraint definitions.
Step-by-Step Guide: How to Generate an ERD
- Export your SQL Schema DDL: Use `mysqldump --no-data`, `pg_dump --schema-only`, or copy your migration SQL files (`V1__init.sql`).
- Paste into Editor: Paste the text into the left SQL script box.
- View Live Diagram: The tool instantly parses all `CREATE TABLE` blocks, highlighting primary key icons () and foreign key relationships ().
