Best Free ERD Tools Online in 2026 — Compared
A good ERD tool should do more than draw boxes and lines — it should understand your database. This guide compares the best free online entity-relationship diagram tools available in 2026, rated on SQL support, usability, collaboration, and what's genuinely free versus what's locked behind a paywall.
What Makes a Good ERD Tool?
Not all ERD tools are equal. There's a meaningful difference between a general diagramming tool with table-shaped boxes, and a database-aware design tool. For serious database work, look for:
- SQL awareness: the tool should understand MySQL and PostgreSQL data types
(
INT,VARCHAR,UUID,JSONB, etc.) rather than treating column types as free text. - Constraint support:
PRIMARY KEY,UNIQUE,NOT NULL,FOREIGN KEYshould be first-class features, not labels. - SQL export: the diagram should translate directly to a runnable
CREATE TABLEscript. - Crow's foot notation: the standard visual notation for showing one-to-one, one-to-many, and many-to-many relationships.
- Genuinely free: unlimited diagrams, SQL export, and private storage all at no cost — not just a limited free tier.
Full Comparison
| Tool | SQL-Aware | SQL Export (Free) | Visual Editor | Shareable Links | No Install | Truly Free |
|---|---|---|---|---|---|---|
| SQL Designer | ✓ | ✓ MySQL + PG | ✓ | ✓ | ✓ | ✓ |
| dbdiagram.io | ✓ | ✗ (paid) | ✗ (text DSL) | ~ (paid) | ✓ | ~ (limited) |
| draw.io / diagrams.net | ✗ | ✗ | ✓ | ✗ (file only) | ✓ | ✓ |
| Lucidchart | ✗ | ✗ | ✓ | ~ (paid) | ✓ | ✗ (3 docs max) |
| ERDPlus | ~ (partial) | ✓ (basic) | ✓ | ✗ | ✓ | ✓ |
| QuickDBD | ✓ | ~ (limited) | ✗ (text DSL) | ✗ | ✓ | ~ (limited) |
| MySQL Workbench | ✓ (MySQL only) | ✓ | ✓ | ✗ | ✗ (desktop) | ✓ |
The Tools in Detail
1. SQL Designer — sql-designer.com
Best for: Anyone who needs a fully free, visual, SQL-producing ERD tool for MySQL or PostgreSQL.
SQL Designer is a browser-based database schema designer with a drag-and-drop canvas. You add tables
visually, define columns with real MySQL or PostgreSQL data types, toggle constraints
(PRIMARY KEY, UNIQUE, NOT NULL), and connect columns to
create foreign key relationships drawn in crow's foot notation. When your schema is ready, export a
complete, runnable CREATE TABLE script. You can also import an existing SQL schema to
visualise it instantly.
Collaboration features include shareable links (read-only, editable, or approval-based), embeddable iframes, and real-time multiplayer editing. All of this is free — no credit card, no document limit, no subscription tier required.
Verdict: the strongest all-round free ERD tool for real database design work.
2. dbdiagram.io
Best for: Developers who prefer defining schemas in code (DBML syntax) and don't need SQL export on the free plan.
dbdiagram.io is a text-first tool: you write your schema in DBML (Database Markup Language) on the left, and it renders a visual diagram on the right. It's fast for developers who can type a schema directly and want clean, shareable documentation. The diagram output is polished.
The main limitations on the free tier: SQL export is paywalled, diagrams are public by default (private diagrams require payment), and there's no real-time multiplayer editing without upgrading.
Verdict: excellent for code-first teams who want documentation; limited as a free design tool due to the SQL export paywall.
3. draw.io / diagrams.net
Best for: Conceptual data models and communication diagrams where SQL output isn't needed.
draw.io is a free, open-source diagramming tool with a large shape library including entity and table shapes. It's entirely visual — drag shapes, add labels, draw connectors. It has no SQL awareness: column types are plain text, constraints don't exist as concepts, and there's no SQL export. Saves locally, to Google Drive, or to GitHub. Has a desktop application and a browser version.
Verdict: great for conceptual diagrams and whiteboard sessions; not suitable for producing a working database schema.
4. Lucidchart
Best for: Teams already using Lucidchart for other diagram types who want ER diagrams in the same platform.
Lucidchart is a polished, all-in-one diagramming platform with ER diagram templates. Like draw.io, it's not SQL-aware — no data type enforcement, no constraint support, no SQL export. The free tier is limited to three documents, which is quickly exhausted. Paid plans start around $9/month per user. Integrates well with Confluence, Google Workspace, and Microsoft 365.
Verdict: a premium general-purpose tool that happens to include ER templates; not a database design tool, and expensive for serious usage.
5. ERDPlus
Best for: Students and educators working through database coursework.
ERDPlus is a free web tool for drawing ER and relational diagrams. It can convert an ER diagram to a relational schema and generate some basic SQL. The interface is functional but dated — designed for academic use rather than professional projects. No collaboration, no shareable links, no real-time multiplayer. The SQL output is limited compared to a dedicated design tool.
Verdict: useful for learning database concepts; not recommended for production schema design.
6. QuickDBD
Best for: Quick schema sketches using a simple text syntax.
QuickDBD is a text-based schema tool where you type table definitions in a simple format and it renders a diagram. The syntax is simpler than DBML, making it accessible to non-developers. SQL export is available but limited on the free tier (a small number of tables). No visual editor — you type your schema, you don't draw it. No collaboration or sharing features on the free plan.
Verdict: a quick option for text-based schema sketching; limited table count and no free sharing restrict its usefulness.
Which ERD Tool Should You Use?
Here's a simple decision guide:
- You want visual drag-and-drop + real SQL export, completely free: use SQL Designer.
- You prefer writing schema definitions in code: use dbdiagram.io (but budget for SQL export if you need it).
- You need a conceptual diagram for a presentation, not a working schema: use draw.io — it's free and excellent for that purpose.
- You're studying database design: ERDPlus covers the basics for free.
- You're already using MySQL Workbench and want the full admin toolset: its EER diagram editor is the most capable SQL-aware option, but requires installation and is MySQL-only.
Frequently Asked Questions
What is the best free ERD tool online?
For a genuinely free tool that combines visual design with real SQL output, SQL Designer is the strongest option in 2026. It requires no payment for any of its core features: unlimited diagrams, MySQL and PostgreSQL SQL export, private storage, shareable links, and real-time collaboration.
Can I create an ER diagram online without installing anything?
Yes — all of the browser-based tools in this list (SQL Designer, dbdiagram.io, draw.io, Lucidchart, ERDPlus, QuickDBD) run entirely in the browser. SQL Designer's demo doesn't even require an account to try.
What is the difference between a conceptual ERD tool and a database design tool?
A conceptual ERD tool (draw.io, Lucidchart) draws diagrams that represent the idea of a database. A database design tool (SQL Designer, MySQL Workbench) knows what a database actually is — it enforces real data types, supports actual constraint semantics, and can produce SQL DDL that you can run. If you need the output to be a working database, you need the latter.
The best free ERD tool — try it now
SQL Designer: visual drag-and-drop schema design for MySQL and PostgreSQL. Free SQL export, unlimited diagrams, shareable links, real-time collaboration. No credit card, no install.
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