They inherited a database
They need to understand structure quickly without reading every table definition line by line.
Free ERD generator for SQL and legacy databases
Turn SQL and inherited schemas into ERD diagrams you can actually work with.
DataPilot ERD helps engineers, analysts, architects, consultants, and product teams convert SQL into a visual schema, inspect legacy databases faster, document table relationships, and share one clear ERD workspace for review.
Why teams actually open an ERD tool
They have SQL but not a usable diagram
They want to paste DDL and generate the first visual pass instead of redrawing the schema by hand.
They need one review surface
They want one workspace where teammates can see the same structure, notes, and changes.
They need documentation that stays close to the diagram
They want notes, relationships, and explanation to live next to the schema instead of in scattered screenshots.
Feature paths
ERD diagram generator
Start with the broad public entry point for online ERD creation and visual schema work.
SQL to ERD
Convert DDL into a first visual model and keep refining from there.
ERD without foreign keys
Work through incomplete legacy schemas and reconstruct relationships faster.
Large schema visualizer
Reduce noise and focus the part of a high-table-count schema that matters.
Collaborative ERD review
Review one diagram together with named presence, controlled editing, and revision refresh.
Database documentation with diagrams
Keep notes, explanations, and structure in the same visual documentation layer.
Beyond diagrams
Need the workflow after the diagram too?
Use DataPilot when the job moves beyond schema exploration into trusted delivery, internal controls, and broader business workflows.
Team workflow after ERD review
Move from diagrams into a collaborative SQL workspace, scheduled SQL reports, and business KPI reporting.
Protected internal workflows
Keep sensitive work inside private execution for protected databases and broader internal data workflows.
FAQ
Common questions about the free ERD tool.
Can I generate an ERD from SQL?
Yes. DataPilot ERD lets you import SQL into the visual canvas so you can start from an existing schema instead of rebuilding tables manually.
Is this useful for legacy databases?
Yes. The tool is especially useful when you inherit a schema and need a faster visual overview of tables, relationships, and dense areas of the model.
Does the free tool support collaboration?
Yes. You can open shared workspaces, see named participants, and review diagrams together with a lightweight collaboration flow.