SQL to Schema Diagram Online: Convert SQL to ERD in Seconds

The short version

You have SQL. You need a diagram. The fastest path from `CREATE TABLE` to a visual schema is a tool that parses SQL and renders an ER diagram on the spot.

[dbdiagramr](https://www.dbdiagramr.space/visualize) does exactly that -- paste your SQL, get an interactive diagram in seconds. No signup, no install, no export limits.

Why convert SQL to a schema diagram?

SQL is precise. Diagrams are comprehensible. When you're onboarding to a new codebase or explaining a schema to a non-technical stakeholder, a visual representation does something SQL can't: it shows relationships at a glance.

Reading 200 lines of `CREATE TABLE` statements, you'll find the foreign keys eventually. Seeing them drawn as lines between boxes takes half a second.

How to convert SQL to a schema diagram online

Step 1: Get your SQL

Grab your schema from one of these sources:


  - `pg_dump --schema-only yourdb`
  - Migration files (Prisma, Drizzle, Rails, Django)
  - Your IDE's schema export
  - A SQL file you already have

Step 2: Paste into dbdiagramr

Go to [dbdiagramr.com/visualize](https://www.dbdiagramr.space/visualize) and paste your SQL in the editor. The tool parses CREATE TABLE statements, detects primary keys, and maps foreign key relationships automatically.

Step 3: Explore and export

Your ER diagram appears instantly. Pan, zoom, drag tables around to arrange them. When you're happy, export as SVG or PNG with one click.

What SQL syntax works?

dbdiagramr understands standard PostgreSQL syntax:


  - `CREATE TABLE` with columns and types
  - `PRIMARY KEY` constraints
  - `REFERENCES` for foreign keys
  - `DEFAULT` values
  - `NOT NULL` and `UNIQUE` constraints
  - `ON DELETE` and `ON UPDATE` actions

If your SQL is valid PostgreSQL, dbdiagramr will parse it.

Example: converting a Laravel migration

If you're using Laravel, your migrations live in `database/migrations/`. Export them to SQL and paste the result:

-- Laravel migration exported to SQL
CREATE TABLE users (
  id BIGSERIAL PRIMARY KEY,
  name VARCHAR(255) NOT NULL,
  email VARCHAR(255) UNIQUE NOT NULL,
  password VARCHAR(255) NOT NULL,
  remember_token VARCHAR(100),
  created_at TIMESTAMPTZ,
  updated_at TIMESTAMPTZ
);

CREATE TABLE posts (
  id BIGSERIAL PRIMARY KEY,
  user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title VARCHAR(255) NOT NULL,
  slug VARCHAR(255) UNIQUE NOT NULL,
  body TEXT,
  published BOOLEAN DEFAULT FALSE,
  created_at TIMESTAMPTZ,
  updated_at TIMESTAMPTZ
);

dbdiagramr renders the `users` and `posts` tables with the foreign key relationship drawn between them. Done in seconds.

Alternative methods (and why they're slower)

    | pgAdmin ERD tool | Already installedMediumSnapshot, manual re-run |
    | Draw.io + manual | ShortSlowHand-draw every table |
    | dbdiagram.io | Account requiredFastMust learn DBML syntax |
    | dbdiagramr | NoneInstantPostgreSQL only (for now) |


dbdiagramr is the only option that requires zero setup and accepts raw SQL directly.

FAQ

**Can I convert MySQL SQL to a diagram?**Not yet. dbdiagramr currently supports PostgreSQL syntax only. MySQL support is planned.

**Does it work with Prisma schema files?**Not directly. Export your Prisma schema to SQL first with `prisma db pull` or `pg_dump`, then paste the SQL.

**How large a schema can it handle?**dbdiagramr handles schemas with dozens of tables comfortably. Very large schemas (100+ tables) may need some manual arrangement, but the parsing works fine.

**Is there a table limit?**No. Paste as many tables as you want. No signup, no limits.