Free dbdiagram.io Alternative for ER Diagrams — No Signup Required

dbdiagram.io is a popular text-based ERD tool — you write simple DSL code and it renders a database diagram. But it requires a free account to save diagrams, and the paid plan costs $9/month. If you want the same concept — write text, get a diagram — without creating an account, this guide covers the free alternative and how they compare.

Our free ERD maker uses Mermaid's erDiagram syntax, which is close to what dbdiagram.io uses. Most dbdiagram definitions can be adapted to render in under a minute.

dbdiagram.io vs Free ERD Maker — Feature Comparison

Here is how the two tools compare on the features that matter most for database documentation:

Feature	dbdiagram.io	Free ERD Maker (WildandFree)
Signup required	Yes (free account required to save)	No — zero signup
Watermark on export	No (free tier: watermark on PNG export)	No watermark
Text-based input	Yes — DBML syntax	Yes — Mermaid erDiagram syntax
Export PNG	Free (with watermark), paid to remove	Free, no watermark
Export SVG	Paid plan only	Free
Auto-render on type	Yes	Yes (500ms debounce)
Crow's foot notation	Yes	Yes
Relationship types	one-to-one, one-to-many, many-to-many	Same
Cloud save	Yes (requires account)	No (browser session only)
Collaboration	Paid plan	No
Price	Free (limited) / $9/mo	Free forever

The free ERD maker is best for one-off diagrams, documentation screenshots, and projects where you do not need cloud persistence. dbdiagram.io is better if you need to share a diagram URL with teammates or iterate on a diagram across multiple sessions.

Converting dbdiagram.io Syntax to Mermaid erDiagram

Both tools use text-based input, but the syntax is different. Here is a side-by-side comparison so you can quickly adapt existing dbdiagram definitions:

Concept	dbdiagram.io DBML	Mermaid erDiagram
Table definition	Table users { id int [pk] }	USERS { int id PK }
One-to-many	Ref: orders.user_id > users.id	USERS ||--o{ ORDERS : places
One-to-one	Ref: profiles.user_id - users.id	USERS ||--|| PROFILES : has
Many-to-many	Ref: posts.id <> tags.id	POSTS }o--o{ TAGS : tagged
Foreign key notation	[ref: > table.column]	int column_id FK (label on relationship line)
Note / comment	// comment	%% comment

The biggest structural difference: in DBML, you define relationships separately with Ref statements. In Mermaid erDiagram, relationships are defined in a line connecting two entity names. Both produce crow's foot diagrams — the output looks nearly identical.

Sample ERD — User/Orders Schema

Here is a complete example you can paste directly into the free ERD maker:

erDiagram
    USERS {
        int id PK
        string name
        string email
        string password_hash
        datetime created_at
    }
    ORDERS {
        int id PK
        int user_id FK
        decimal total
        string status
        datetime order_date
    }
    PRODUCTS {
        int id PK
        string name
        decimal price
        int stock_qty
        string sku
    }
    ORDER_ITEMS {
        int id PK
        int order_id FK
        int product_id FK
        int quantity
        decimal unit_price
    }
    ADDRESSES {
        int id PK
        int user_id FK
        string street
        string city
        string country
    }

    USERS ||--o{ ORDERS : "places"
    ORDERS ||--|{ ORDER_ITEMS : "contains"
    PRODUCTS ||--o{ ORDER_ITEMS : "included in"
    USERS ||--o{ ADDRESSES : "has"

Paste this into the ERD Code field and click Render. The diagram will appear in the preview pane immediately. Then export as PNG for documentation or SVG for scalable use in presentations.

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When to Use Text-Based ERD Tools vs Drag-and-Drop

dbdiagram.io and this free ERD maker share a key philosophy: define your schema in text, not by dragging boxes. This approach has real advantages over traditional drag-and-drop diagramming tools like Lucidchart or Visio:

Situation	Text-based ERD	Drag-and-drop (Lucidchart/Visio)
Initial database design	Faster — type the schema, diagram follows	Slower — must position each entity manually
Updating schema	Edit the text, diagram auto-updates	Must manually move boxes and reconnect lines
Version control	Text diffs in git	Binary file, no meaningful diffs
Sharing the definition	Paste the text into a README	Export image file
Complex diagrams (30+ tables)	Layout control is limited	More control over positioning
Collaborative real-time editing	dbdiagram.io (paid) only	Lucidchart, draw.io (paid)

For most development teams documenting a database schema, a text-based ERD is faster and produces better results. For large, complex diagrams where layout matters for readability, drag-and-drop tools give more control.

Export Options — PNG vs SVG

The free ERD maker exports in two formats:

PNG export: Best for embedding in documents, GitHub READMEs, Confluence pages, Notion databases, or anywhere you just need an image. The exported PNG is 2x resolution (HiDPI), so it looks sharp on retina displays and when printed.

SVG export: Best for presentations, reports, and use cases where you may need to scale the diagram to a large size without pixelation. SVG is also editable in design tools like Figma, Sketch, and Inkscape if you need to customize the layout.

dbdiagram.io limits SVG export to paid plans — here it is always free. If you need the SVG format for a one-time documentation task, this free tool avoids the $9/month subscription entirely.

Limitations of the Free ERD Maker

Being honest about limitations helps you decide when this tool is the right fit:

• No cloud save: Diagrams are not saved between sessions. Copy your ERD code to a text file or your git repository before closing the tab.
• No collaboration: Cannot share a live link to a diagram that others can view or edit in real time.
• No version history: No built-in change tracking. Use git for version control of the text definition.
• No auto-import from existing databases: The tool does not connect to a database to auto-generate the diagram. You write the entity definitions manually.
• Layout is auto-arranged: The diagram layout is controlled by the Mermaid renderer — you cannot manually position entities. For very large schemas, this can result in cramped layouts.

For these use cases, dbdiagram.io (paid) or a tool like DBeaver (which can connect to a live database and auto-generate an ERD) may be a better fit. This tool excels for quick documentation diagrams that do not need to persist.

Frequently Asked Questions

Can I convert my dbdiagram.io diagram to Mermaid format?

There is no automated converter, but the syntax is similar enough to convert manually. Define each table as an entity block (TABLENAME { type column PK/FK }), then add relationship lines between entity names using Mermaid notation (||--o{, ||--||, }o--o{). A 10-table schema typically takes 10-15 minutes to translate.

Does this tool support the same relationship types as dbdiagram.io?

Yes. Both tools support one-to-one, one-to-many, and many-to-many relationships with crow's foot notation. The visual output looks nearly identical — both use standard database ERD notation.

Is there a limit to how many entities I can add?

No hard limit is enforced by the tool. In practice, very large diagrams (30+ entities) can become hard to read because the layout engine positions entities automatically. For large schemas, consider breaking them into multiple smaller diagrams by domain area (e.g., user management, orders, inventory as separate diagrams).

Can I use this tool for free without making an account?

Yes, completely. No account, no email, no signup. Open the tool, write your ERD code, click Render, export PNG or SVG. Nothing is stored on our servers — everything runs in your browser.