New free SQL-to-ER diagram tool runs entirely in your browser

A new free tool lets developers instantly visualize SQL schemas as Entity‑Relationship (ER) diagrams — entirely within the browser and without uploading any data. To use it, just paste your CREATE TABLE statements on the left side of the screen; the tool parses them and renders an interactive diagram on the right. You can drag tables to rearrange the layout, scroll to zoom in/out, double‑click any table to rename it, and export the final diagram when done. A built‑in example schema helps first‑time users explore the interface. Because everything runs locally, your schema never leaves your computer — no accounts, no uploads, no privacy concerns.

This approach solves a common pain point for developers who want to quickly document or review a database schema without setting up a dedicated tool or exposing sensitive schema details to a third‑party server. The drag‑and‑drop layout, zoom controls, and rename‑on‑click make it simple to produce clear, publication‑ready diagrams. For teams working on legacy databases or planning new schemas, this tool offers a lightweight, zero‑install way to visualize relational structures. It’s particularly useful during code reviews, onboarding, or when designing data models — the instant feedback lets you spot foreign key relationships and table splits at a glance.