DBML to Mermaid

How it works

1. Paste your DBML (from dbdiagram.io or a .dbml file) — DBML is auto-detected.
2. The diagram renders instantly so you can confirm tables and relations.
3. Click Export → Mermaid and copy the erDiagram code.
4. Drop it into any Mermaid-aware Markdown (GitHub, GitLab, Notion, Obsidian…).

Example

This DBML:

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

…exports as this Mermaid:

erDiagram
    users {
        integer id PK
        varchar email
    }
    posts {
        integer id PK
        integer user_id FK
    }
    users ||--o{ posts : "user_id"

Copy it from Export → Mermaid. Try it with your own →

Guide

This conversion maps DBML's relational model onto Mermaid's erDiagram grammar: each Table becomes an entity block, [pk]/[unique]/[ref: settings become PK/UK/FK attribute markers, and each Ref: line becomes a relationship with matching cardinality — a one-to-many > ref becomes ||--o{, a one-to-one - ref becomes ||--||.

The destination matters: Mermaid renders natively in GitHub, GitLab, Notion, Obsidian and most static-site generators. Converting DBML → Mermaid is how you take a schema that lives in a DBML toolchain (dbdiagram, dbdocs) and put it in a README that must render without JavaScript or images — Mermaid blocks are text, so they diff, review and survive repo moves.

As with every export on this site, the live diagram is the proof: what you see on the canvas before copying is exactly what the Mermaid encodes, because both come from the same parse. If a Ref is missing from the render, it was missing from the DBML — fix it once, export again.

Why use it

• Private: everything runs in your browser — nothing is uploaded or stored on a server.
• Paste-ready Mermaid for GitHub / GitLab / Notion / Obsidian.
• Round-trip — import DBML, export Mermaid, PlantUML, PNG or SVG.
• Free & open source — no account, no sign-up.

FAQ

How do I convert DBML to Mermaid?

Paste your DBML, then click Export → Mermaid and copy the erDiagram code. Tables become entities and Ref: relations become Mermaid relationships.

Where can I use the Mermaid output?

Anywhere Mermaid renders: GitHub & GitLab Markdown, Notion, Obsidian, docs sites, and the Mermaid Live Editor.

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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