SQL Workbench

SQL Workbench is a free online SQL editor that runs entirely in your browser. It lets you query CSV, JSON, Parquet, Arrow, and DuckDB files by dragging and dropping them into the interface. You can also pull data from any URL that supports CORS, making it easy to explore public datasets without downloading them first. Everything happens locally — your files never leave your machine.

The tool relies on DuckDB WebAssembly, a high-performance analytical database engine compiled for the browser. You get a full SQL editor with syntax highlighting, query history with replay, schema browsing, and the ability to generate ER diagrams from your tables. You can also visualize query results as charts and export them to CSV, JSON, or Arrow. A standout feature is the local AI model integration for text-to-SQL — describe what you want in plain English and get a SQL query back, all processed on your device.

This is a great fit for data analysts, developers, and anyone who needs to quickly explore structured data without setting up a database server. Use it to inspect a CSV export, join local files with remote datasets, or prototype queries for a larger project. Since it’s free and needs no installation, it works well for teaching SQL or sharing live analyses with teammates who just need a browser.