Your file never leaves the browser

Drop a Parquet, CSV, TSV or NDJSON file. DuckDB-WASM opens it in a Web Worker in this tab; the grid pushes every filter, sort and aggregate into it. Nothing is uploaded — closing the tab discards it.

Bytes sent since this file was opened: 0

Grid — DuckDB pushdown

Chart

Statistics (subset vs. population)

Last DuckDB SQL

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Open DevTools → Network while you filter or sort: for a dropped file, no request ever appears — every query above runs against the file on this machine, in the worker.