About DataToolsOnline

DataToolsOnline is a toolkit for people who work with datasets: data engineers, analysts, developers and students. It focuses on CSV, JSON and Parquet, and on the jobs that come up constantly: looking at a file, profiling it, checking its quality, querying it with SQL, cleaning it and converting it.

Local processing by design

The core tools are built on DuckDB-Wasm, an analytical database compiled to WebAssembly. It runs inside your browser, so your file is read on your own device and does not need to be sent to a server. See the privacy page for what that does and does not mean.

Not a converter farm

This is not a collection of near-identical converter pages. Each tool is meant to do real work on your data, and every number a tool shows is computed from the file you opened.

Current status

The site is in early development and tools are released one at a time. Anything marked “Coming soon” on the tools page is not available yet.