WhatTheDuck – Browser-Based SQL Engine Powered by DuckDb on WASM

In plain words

WhatTheDuck is a browser-based SQL tool that lets users run SQL queries directly on CSV files without uploading data anywhere. Built on DuckDB running in WebAssembly, it processes files locally in the browser, making it useful for developers and data analysts who need quick SQL analysis of CSV data without external servers or privacy concerns.

written from the facts on this page · September 2026

From the sources

WhatTheDuck, a revolutionary tool by Incentius that allows you to run SQL queries on CSV files directly in your browser. This free-to-use tool, built on DuckDB over WASM, ensures a fast, efficient, and secure experience as no data is sent to the backend.

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  WhatTheDuck – open-source, in-browser SQL on CSV files2024 · github.com · ▲119

  WhatTheDuck is an in-browser sql tool to analyze csv files that uses duckdb-wasm under the hood. Please provide feedback/issues/pull requests.

• DU
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