SQL ERD Diagram Generator
Paste your SQL CREATE TABLE statements to instantly visualize your database schema as an entity-relationship diagram. Shows tables, column types, primary keys, foreign keys, and relationships between tables.
Frequently Asked Questions
What SQL dialects are supported?▼
The ERD generator supports standard SQL CREATE TABLE syntax including PostgreSQL, MySQL, and SQLite. It parses column definitions, PRIMARY KEY constraints (both inline and table-level), and FOREIGN KEY references.
How do I add foreign key relationships?▼
Use FOREIGN KEY syntax in your CREATE TABLE: `FOREIGN KEY (column_name) REFERENCES other_table(column_name)`. The diagram will draw a connecting line between the two tables.
Can I export the diagram?▼
Yes — use the Copy SVG button to get the raw SVG markup, which you can paste into a vector editor (Inkscape, Figma, Illustrator) or embed directly in documentation.
What is an ERD used for?▼
Entity-Relationship Diagrams show database structure visually. They help developers understand table relationships, onboard new team members to existing schemas, and document database designs in technical specifications.
How are primary keys shown?▼
Primary key columns are marked with a key icon (🔑) and bold text in the table diagram. Foreign key columns that reference another table are marked with a link icon (🔗).
Related Products
on GumroadDeveloper Cheat Sheet Bundle
10 print-ready cheat sheets for the tools developers use every day: Git, Docker, Linux CLI, SQL, Regex, HTTP Status codes, VS Code shortcuts, Bash scripting, jq/JSON, and Markdown.
Buy on Gumroad →Developer Productivity Bundle
Stop rebuilding the same setup every project. 51 VSCode snippets, 40 Git aliases, 5 Docker Compose stacks, 5 GitHub Actions workflows, 5 README templates, and a dotfiles kit. Set up a professional dev environment in under an hour.
Buy on Gumroad →AI Prompt Engineering Toolkit
58 structured prompt templates for Claude, ChatGPT, and Gemini — organized by use case. Code Review, Debugging, Documentation, Architecture, and 10 model-specific tips. Stop writing prompts from scratch.
Buy on Gumroad →You Might Also Need
SQL Formatter & Beautifier
Format and beautify SQL queries online. Auto-indent SELECT, FROM, WHERE, JOIN clauses, uppercase keywords, and minify SQL to a single line. Supports MySQL, PostgreSQL, SQLite. Free, runs in browser —
Open free tool →
SQL Query Formatter
Format and prettify SQL queries online. Auto-indent SELECT, FROM, WHERE, JOIN clauses, uppercase or lowercase keywords, configurable indent size. Supports MySQL, PostgreSQL, SQLite. Runs in browser.
Open free tool →
Prisma Schema Visualizer
Paste your Prisma schema to instantly visualize it as an interactive ER diagram. Draggable model cards with color-coded field types and relation arrows.
Open free tool →
More Free Tools
Related Articles
Database Indexing Strategies Every Developer Must Know
Master database indexing in 2026. Learn B-tree, hash, composite, partial, and covering indexes with practical SQL examples for PostgreSQL and MySQL.
PostgreSQL vs MySQL: Which to Choose in 2026?
Comprehensive comparison of PostgreSQL and MySQL in 2026. Performance, JSON support, replication, licensing, and a decision framework for choosing the right database for your project.
PostgreSQL vs MySQL 2026: Which Database Should You Choose?
A comprehensive comparison of PostgreSQL and MySQL in 2026. Deep dive into performance, JSON support, replication, ecosystem, and which database fits your use case.
SQL Best Practices for Modern Development in 2026
Essential SQL best practices every developer should follow in 2026. Covers query optimization, indexing strategies, security patterns, and database design principles for PostgreSQL, MySQL, and SQLite.
SQLite vs PostgreSQL vs MySQL: Database Selection Guide 2026
A comprehensive technical comparison of SQLite, PostgreSQL, and MySQL for 2026 — covering ACID compliance, performance benchmarks, JSON support, replication, and which database to choose for your use case.
Enjoying this tool? Get more like it.
Weekly developer tool guides, productivity playbooks & AI tricks. Free. No spam.
Unlock AI-Powered Dev Tools
- ⚡ AI Code Review, Doc Generator & SQL Builder
- ⚡ All premium templates & early access
- ⚡ Member discounts on Gumroad products
$9/mo after trial · Cancel anytime
Want the full toolkit?
Get DevPlaybook Pro
Every template, guide, boilerplate, and automation script in one bundle. 13 premium products — grab them all at once and save big.
MIT licensed · Instant download · No subscription
See what's included → Browse all deals →