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ErdDocs
What it is
ErdDocs is a browser-based tool that turns relational database schemas into interactive entity-relationship diagrams and printable data dictionaries. It reads PostgreSQL and MySQL dumps, Prisma, DBML, Mermaid, PlantUML, Django, SQLAlchemy, Sequelize, TypeORM, and Laravel migrations. Parsing and rendering happen in the browser, and the schema is not uploaded. Users can drag, focus, or hide tables and share a diagram link. Exports include PNG, SVG, Mermaid, DBML, PlantUML, SQL DDL, and a printable dictionary; Mermaid suits GitHub diagrams and DBML opens in dbdiagram.io. ErdDocs does not connect to a live database, so users export and paste schemas themselves. The free plan draws up to 25 tables in full, previews a three-table dictionary, and adds branding to exports. A lifetime license costs $9, paid once, with no renewal, any schema size, a complete dictionary, unbranded exports, and activation in any browser. Local license verification allows offline use. Purchases can be refunded within 14 days.
For and against
For
- Parses many database and modeling formats
- Runs parsing and rendering in the browser
- Exports diagrams and printable dictionaries
- Lifetime license has no renewal
- Supports offline use after local activation
Against
- Free tier fully draws only 25 tables
- Free dictionary is limited to three tables
- Free exports carry ErdDocs branding
- Does not connect to live databases
The verdict
ErdDocs combines broad schema input support with local processing and multiple export formats. The free tier is constrained for larger documentation jobs, while the one-time license removes those limits.
Who it suits
It suits developers, data teams, and consultants documenting relational schemas for onboarding, audits, or client handover. It also fits users who want local browser parsing rather than uploading schemas.
Plans and prices
Free
Up to 25 tables drawn in full · dictionary preview for three tables · exports carry ErdDocs branding
Read 8 Oct 2026 · erddocs.com
Lifetime license
Any schema size · complete printable data dictionary · unbranded exports · activate in any browser
Read 8 Oct 2026 · erddocs.com
On the record
- Database connection
- ErdDocs does not connect to a live database; users export and paste the schema themselves.erddocs.com · read 8 Oct 2026
- Diagram behavior
- Users can drag, focus, and hide tables, and share a diagram link.erddocs.com · read 8 Oct 2026
- Exports
- It exports PNG, SVG, Mermaid, DBML, PlantUML, SQL DDL, and a printable data dictionary.erddocs.com · read 8 Oct 2026
- Format limitation
- Django on_delete and default behavior are not drawn; only db_default is represented.erddocs.com · read 8 Oct 2026
- Input formats
- It reads PostgreSQL and MySQL dumps, Prisma, DBML, Mermaid, PlantUML, Django, SQLAlchemy, Sequelize, TypeORM, and Laravel migrations.erddocs.com · read 8 Oct 2026
- Integrations
- The site describes format support and exports, including Mermaid diagrams for GitHub and DBML that opens in dbdiagram.io.erddocs.com · read 8 Oct 2026
- Intended use
- The site describes the data dictionary as useful for onboarding, audits, and client handover.erddocs.com · read 8 Oct 2026
- Payment
- Paddle processes orders as merchant of record, and ErdDocs says it does not see or store card details.erddocs.com · read 8 Oct 2026
- Privacy
- Parsing and rendering run in the browser, and the schema is not uploaded.erddocs.com · read 8 Oct 2026
- Purpose
- ErdDocs turns database schemas into interactive ER diagrams and printable data dictionaries.erddocs.com · read 8 Oct 2026
- Refunds
- The pricing page states that purchases can be refunded within 14 days, no questions asked.erddocs.com · read 8 Oct 2026
- Schema limit
- The free tier draws up to 25 tables in full; larger schemas are parsed, with tables beyond the limit shown as locked placeholders.erddocs.com · read 8 Oct 2026
- Security
- License keys are verified locally in the browser, so an unlocked tool continues to work offline.erddocs.com · read 8 Oct 2026
- Support
- Support is handled by one person at [email protected], with no service desk or response-time promise.erddocs.com · read 8 Oct 2026
