Database Schema & ER Diagram Designer
Local schema modelParse, edit, visualize, compare and export SQL or DBML database schemas in the browser.
Tables
Columns
Relations
Issues
How to use it
- 01
Import schema source
Paste or open bounded SQL DDL or DBML and choose the intended database dialect.
- 02
Design and inspect relationships
Browse editable tables and fields, search a scalable ER canvas, and review primary keys, foreign keys and structural diagnostics.
- 03
Compare and export
Save or paste a baseline, classify schema evolution risk, and export interoperable source, diagram, dictionary and evidence formats.
Frequently asked questions
Does it connect to a database?
No. It parses schema text and never requests credentials or opens a database connection.
Which SQL dialects are supported?
Common CREATE TABLE syntax for PostgreSQL, MySQL, SQLite and SQL Server is supported; vendor-specific procedures and every ALTER form are outside the bounded parser.
Is the ER layout editable?
The diagram is searchable and scalable, while structural edits happen in the table editor and regenerate the source.
Does a breaking label guarantee migration failure?
No. It is a deterministic review classification for removals, type changes and stricter nullability; validate production data and migration tooling separately.
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