April 2026 — 6 min read

Free PostgreSQL DB Designer Online — Visual ERD Tool for Postgres

Designing a PostgreSQL database visually is faster and less error-prone than writing DDL by hand. A free Postgres DB designer lets you add tables, define columns with PostgreSQL-specific types, draw foreign key relationships, and export a ready-to-run CREATE TABLE script — all in the browser, without installing anything.

Why Use a Visual Designer for PostgreSQL?

PostgreSQL has a richer type system than most databases — SERIAL, UUID, JSONB, ARRAY, custom ENUM types, and more. Managing all of this in raw DDL across many tables becomes hard to read and easy to get wrong.

A visual Postgres DB designer keeps the schema readable at a glance. You can see all your tables, their relationships, and how they connect — on a single canvas. When you add a FOREIGN KEY, you draw a line rather than writing a constraint clause. When you rename a column, the diagram updates immediately. And when you're ready to implement, you export clean PostgreSQL SQL.

PostgreSQL vs. MySQL: What Changes in Schema Design?

If you've designed MySQL schemas before, PostgreSQL has some important differences to be aware of when using a DB designer:

Feature	MySQL	PostgreSQL
Auto-increment	`AUTO_INCREMENT`	`SERIAL` or `GENERATED ALWAYS AS IDENTITY`
String type	`VARCHAR(n)`	`VARCHAR(n)` or `TEXT`
Boolean	`TINYINT(1)`	`BOOLEAN`
JSON	`JSON`	`JSON` or `JSONB` (indexed)
UUID	stored as `VARCHAR(36)`	native `UUID` type
Enum	`ENUM('a','b')` inline	`CREATE TYPE` first, then reference it

A good PostgreSQL DB designer understands these differences and uses the correct type names in the exported SQL — so you don't end up with MySQL syntax in a Postgres script.

PostgreSQL Types Supported in SQL Designer

SQL Designer supports the full set of common PostgreSQL column types, including:

Integer: SMALLINT, INTEGER, BIGINT, SERIAL, BIGSERIAL
Decimal: NUMERIC, DECIMAL, REAL, DOUBLE PRECISION
String: VARCHAR, CHAR, TEXT
Date/Time: DATE, TIME, TIMESTAMP, TIMESTAMPTZ, INTERVAL
Other: BOOLEAN, UUID, JSON, JSONB, BYTEA

When you export SQL, the script targets PostgreSQL syntax — using SERIAL for auto-increment, BOOLEAN instead of TINYINT(1), and correct constraint clause formatting.

SQL Designer — Free Postgres DB Designer

SQL Designer is a free, browser-based PostgreSQL database designer. It supports both MySQL and PostgreSQL — you choose the target when you create a diagram, and the type picker and SQL export adjust accordingly.

The drag-and-drop canvas lets you add tables, define columns, set constraints (PRIMARY KEY, UNIQUE, NOT NULL), and draw foreign key relationships. Everything is auto-saved to your account. When you're ready, click Export to generate a clean PostgreSQL CREATE TABLE script.

There's no install, no trial limit, and no subscription needed. A free account gives you unlimited diagrams and full SQL export.

How to Design a PostgreSQL Database with SQL Designer

1. Create a new diagram — sign up for free, create a diagram, and select PostgreSQL as the target database.
2. Add tables — add a table for each entity in your schema (e.g., users, posts, comments).
3. Define columns — add columns with PostgreSQL types and constraints. Use SERIAL or BIGSERIAL for auto-increment primary keys.
4. Draw foreign keys — drag a line from the FK column in a child table to the PK column in the parent. Crow's foot notation shows the relationship cardinality.
5. Export PostgreSQL SQL — generate a CREATE TABLE DDL script ready to run in psql or any PostgreSQL client.

Design your PostgreSQL database for free

SQL Designer is a free Postgres DB designer that runs in your browser. No install, no subscription — build your schema visually and export PostgreSQL DDL.

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