DBML to ER Diagram

How it works

1. Copy your DBML (from dbdiagram.io or a .dbml file).
2. Paste it into the editor — DBML is auto-detected.
3. Tables and Ref: relations are drawn immediately.
4. Arrange, hide tables, then export PNG/SVG or convert to Mermaid/PlantUML.

Example

DBML like this:

Table users {
  id integer [pk]
  email varchar [unique]
}
Table orders {
  id integer [pk]
  user_id integer [ref: > users.id]
  total decimal
}

…renders two tables with a relation from orders.user_id → users.id. Try it with your own →

Guide

This is the dbdiagram-style rendering flow, without the account: export your DBML from dbdiagram.io (Export → DBML), or grab any .dbml file from your repo, paste it here, and the diagram appears immediately. From there it diverges from dbdiagram in useful ways:

• You can rearrange by hand. Drag tables into domain groups — the auto-layout is a starting point, not a cage.
• You can hide tables. Presenting the billing schema? Hide the other 80 tables and screenshot only what matters.
• Exports go both ways. PNG and SVG for docs, but also Mermaid for Markdown and PlantUML for Confluence — DBML in, any format out.

Everything runs locally: the paste, the parse, the render. For internal schemas at companies with strict data policies, that's the reason this page exists — no upload step to argue with security about. The share link (if you use it) encodes the whole diagram in the URL fragment itself; there's no database on the other end holding your schema.

Why use it

• Private: everything runs in your browser — nothing is uploaded or stored on a server.
• Interactive: drag tables, auto-arrange, hide noise, add notes, and manually link columns.
• Convert DBML to Mermaid, PlantUML, PNG or SVG.
• Free & open source — no account, no sign-up.

FAQ

Is this a free dbdiagram alternative?

Yes — paste DBML and get an interactive diagram for free, with no account. You can also export to Mermaid, PlantUML, PNG or SVG.

Does it support Ref and inline references?

Yes — both standalone Ref: lines and inline [ref: > table.col] settings are parsed.

Is my schema uploaded anywhere?

No. Everything runs locally in your browser — your schema is never uploaded to or stored on any server.

Is it free?

Yes. It is completely free and open source, with no account or sign-up required.

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