Top Free PostgreSQL ER Diagram Tools (2026): Compared | DbSchema
If you work with PostgreSQL, an ER diagram tool should do more than draw boxes. It should help you reverse-engineer the schema, understand relationships quickly, organize large databases, and share the result with teammates.
For most PostgreSQL teams, DbSchema is the best free starting point because it combines reverse engineering, visual design, and documentation in one desktop workflow. pgModeler is excellent for PostgreSQL specialists who want a modeling-focused desktop tool, while DBeaver is useful when diagramming is only one part of a broader database IDE.
Quick answer
If you are designing schemas or reverse-engineering PostgreSQL, the best overall free tool is DbSchema. For native PostgreSQL power users, choose pgModeler. For live data exploration, use DBeaver. If you need quick code-first sketches, go with dbdiagram.io, and for cloud collaboration, SQLDBM is the best fit.
If you want a PostgreSQL-specific walkthrough, also read Create ER Diagrams for PostgreSQL and Design a PostgreSQL Schema.
What matters in a PostgreSQL ER diagram tool
The best free PostgreSQL ER diagram tools in 2025 and 2026 usually solve at least one of these jobs well:
- reverse-engineer an existing PostgreSQL database
- design a new schema visually before writing SQL
- handle larger schemas without becoming unreadable
- export diagrams or documentation for the rest of the team
- support PostgreSQL-specific workflows without forcing manual redraws
That is why the comparison below focuses on reverse engineering, design-first capability, and documentation or sharing.
Comparison table
| Tool | Free tier | Reverse-engineers live DB | Desktop app | Pushes DDL |
|---|---|---|---|---|
| DbSchema | Perpetual free desktop app | Yes | Yes | Yes (via Pro schema sync) |
| pgModeler | Free source; binaries from $59 | Yes | Yes | Yes |
| DBeaver | Full free community app | Yes | Yes | No (editor only) |
| SQLDBM | Limited; check vendor pricing | Yes (via cloud/import) | No | No (generates SQL) |
| dbdiagram.io | 10 free diagrams | Not in the app (SQL import; CLI connector can) | No | No |
| ChartDB | Free: 1 database, 10 tables | Yes (via query script) | No (web/server) | No |
| QuickDBD | 1 public diagram, 10 tables | No (SQL import only) | No | No |
| Luna Modeler | 14-day trial, then $99 once | Yes | Yes | Yes |
Tool reviews
1. DbSchema
DbSchema Free is a perpetual desktop application. There is no signup, and the installer bundles a 15-day Pro trial alongside it. The free edition reverse-engineers a live PostgreSQL database through the PostgreSQL JDBC driver, lets you design visually, split a large schema across several diagrams, and browse relational data.
Where it stops is the deployment half of the job. Schema synchronization, which compares the model against the live database and pushes DDL back, and interactive HTML5 documentation both require Pro. The model is saved as a file, so it can sit in Git next to the application code and be reviewed like any other change.
2. pgModeler
pgModeler is an open-source, offline desktop app built for PostgreSQL and nothing else. The core is free and the full source is published, so you can compile it yourself at no cost. Pre-built binaries for Linux, Windows and macOS start at $59 and are sold per platform for a fixed period rather than as a perpetual licence.
It reverse-engineers a live database and can push DDL back through its schema-diff tooling. Because it targets a single engine, it models PostgreSQL-specific objects that generic tools flatten or skip, and that depth of PostgreSQL coverage is what it does better than DbSchema.
3. DBeaver
DBeaver Community Edition is free, open source, and runs offline on the desktop. It gives you full SQL execution, a data editor, and an ER diagram generated from a live PostgreSQL schema.
That diagram is essentially a read-only view. DBeaver will not push diagram-based DDL back to the server, and advanced visual modelling, cloud connectivity and SSO belong to the paid editions, which run $113/year for Lite, $255/year for Enterprise and $510/year for Ultimate. As an everyday SQL IDE and data browser across many engines it is stronger than DbSchema. As a modelling tool it is not.
4. SQLDBM
SQLDBM is browser-based SaaS with no offline desktop application, aimed at teams who want modelling to happen in a shared workspace rather than on one person's machine.
It builds a PostgreSQL model from an imported SQL script or a cloud warehouse connection, and generates DDL for you to run yourself rather than applying changes to the server. Free access is limited and the plan structure changes, so check the current terms on SQLDBM's own pricing page before counting on it. Several people editing one model at the same time is what it does better than DbSchema.
5. dbdiagram.io
dbdiagram.io is a browser-based, code-first tool that does not run offline. You write DBML and it draws the diagram. The free tier allows up to 10 diagrams and a single diagram view, and stops at private diagrams, unlimited tables and version history, which start at $8/month on Personal Pro.
The web app does not connect to a running PostgreSQL server: you paste a SQL dump and it parses that. A live schema can be pulled, but only through the separate @dbml/connector command-line module, not the editor. It cannot push DDL back either way. Turning typed code into a clean diagram is what it does faster than DbSchema.
6. ChartDB
ChartDB is a lightweight web application you can use hosted or self-host yourself.
The free tier is smaller than it first looks: one user, one database, and up to 10 tables in that database, with community-forum support. Raising the ceiling to 100 tables costs $25/month on Pro, and the AI assistant, real-time collaboration and a 200-table limit arrive at the $59 Teams tier. It reverse-engineers a live PostgreSQL database by having you run a query script, and it cannot push DDL back to the server. Its modern browser UI is what it does better than DbSchema, so long as the schema is small enough to fit.
7. QuickDBD
QuickDBD is a fast, browser-based sketching tool rather than a modelling environment, and there is no desktop app. You type, it draws.
The free tier is one public diagram with a maximum of 10 tables. Private diagrams, real-time collaboration and SQL, PDF and RTF export all require Pro, which is $7 for a single week, $14/month, or $95/year and lifts the limit to 10 diagrams with any number of tables. It cannot reverse-engineer a live database or push DDL; it works purely through importing and exporting SQL files. Rapid keyboard-only brainstorming is what it does better than DbSchema.
8. Luna Modeler
Luna Modeler is an offline desktop modelling tool, and the one entry here with no permanent free tier at all: a 14-day trial with no credit card or account, then a one-time $99 licence rather than a subscription.
Within the trial it reverse-engineers a live PostgreSQL database and pushes DDL changes back by generating deployment-ready SQL. It covers a small set of relational engines rather than a broad list, and across that narrower range it offers a more streamlined visual interface than DbSchema.
How to reverse-engineer PostgreSQL in DbSchema
This is the workflow that makes DbSchema the easiest recommendation for many PostgreSQL teams:
- connect through the PostgreSQL JDBC driver
- follow the connect-to-database guide
- let DbSchema generate the diagram view from the live schema
- reorganize tables into cleaner layouts and annotate important areas
- publish the result as schema documentation
That is especially useful when the schema already exists and you need documentation, onboarding material, or a cleaner way to review future changes. If you are designing before implementation, pair this with Entity Relationship Diagram and Steps to Design a Relational Schema.
Best tool by use case
| If you need to... | Best fit |
|---|---|
| reverse-engineer and document PostgreSQL visually | DbSchema |
| work in a PostgreSQL-first modeling environment | pgModeler |
| explore a live schema alongside heavy SQL work | DBeaver |
| collaborate on diagrams in the browser | SQLDBM or ChartDB |
| sketch a fast code-first ERD | dbdiagram.io or QuickDBD |
FAQ
What is the best free ER diagram tool for PostgreSQL?
For most teams, DbSchema is the best free starting point because it combines reverse engineering, visual design, and documentation instead of stopping at diagram generation.
Is pgModeler better than DbSchema for PostgreSQL?
pgModeler is excellent for PostgreSQL-focused modeling, especially for specialists who want a PostgreSQL-first desktop workflow. DbSchema is the better fit when documentation, multiple diagrams, and schema sync are important too.
Can I create a PostgreSQL ER diagram from an existing database?
Yes. DbSchema, pgModeler, DBeaver, and several other tools can reverse-engineer an existing PostgreSQL schema into a diagram.
Which PostgreSQL ER tool is best for documentation?
DbSchema stands out because it can export the model as interactive documentation, not just as a static image.
Are browser-based PostgreSQL ER tools enough for production teams?
They can be enough for planning and collaboration, but production teams often need reverse engineering, schema review, and documentation features that are stronger in desktop tools like DbSchema.
What is the fastest way to understand a large PostgreSQL schema?
Reverse-engineer it into an ER diagram, split it into focused views, and publish documentation for the team. That is exactly where DbSchema is strongest.
Conclusion
The best free PostgreSQL ER diagram tool is the one that helps you understand and maintain the schema after the first diagram is generated. For most teams, that means reverse engineering, better layouts, documentation, and a workflow that can keep evolving with the database.
That is why DbSchema is the most practical recommendation here: it gives PostgreSQL teams a clear path from schema discovery to documentation and ongoing change review.
