Free ERD Editor | Create Database Diagrams Online

Best first template

SaaS billing ERD with customers, subscriptions, invoices, payments, and audit events.

Free-first funnel

Send search visitors to the browser editor first. Ask for Marketplace install only after they know the diagram is useful.

Confluence upgrade

When the diagram belongs in a spec, runbook, ADR, or process page, install diagram.now so it stays editable beside the docs.

Build a readable data model before the meeting

An ERD is most useful when reviewers can see the shape of the model quickly: which entities exist, how they relate, and where ownership or cardinality needs discussion. Start with the few tables that matter most, then expand the diagram as the design stabilizes.

Good ERD starting points

Create diagrams for billing models, customer/account relationships, audit logs, content permissions, analytics events, or integration mappings. Keep names close to the language your team already uses in specs and database migrations.

From free ERD to Confluence documentation

Once the model is useful, add it to the Confluence page where engineers and product reviewers discuss the schema. The free editor is the low-friction entry point; the Marketplace app is the team workflow for keeping ERDs editable beside the surrounding docs.

Start free, then bring it into Confluence

Use the browser editor for the first draft. If the diagram becomes team documentation, install diagram.now from Atlassian Marketplace and keep it editable inside Confluence.

Start drawing free Install from Atlassian Marketplace

FAQ

What is a free ERD editor?

A free ERD editor is an online tool for creating entity relationship diagrams that show database tables, entities, fields, and relationships.

Can I use diagram.now for database diagrams?

Yes. diagram.now can be used to create ERDs and other technical diagrams in the browser, with a Confluence app available when teams want editable diagrams inside Confluence.

What should I include in an ERD?

Start with entity names, important attributes, primary keys, foreign keys, and relationship labels. Add cardinality or notes when they clarify the design review.

Free ERD editor for database diagrams online