Numbeo Prices by City

Open spreadsheet files such as XLSX, XLS and CSV in the browser and convert them to other formats.

Run a real Postgres compiled to WebAssembly in the browser and try SQL against it.

Demo UI of sql.js, SQLite compiled to JavaScript, for running queries on in-memory databases.

Try the Papa Parse CSV parser on pasted or uploaded text and see the parsed rows and config effects.

Converts between many code and data formats, such as JSON to TypeScript, SVG to JSX and CSS to JS.

JupyterLab running entirely in the browser with a WebAssembly Python kernel, no server needed.