Data converter · runs 100% in your browser

Parquet to CSV Converter

Convert Parquet files to CSV in your browser via DuckDB-Wasm — the same SQL engine the data community uses, compiled to WebAssembly. The first conversion of your session loads the engine (~30 MB, cached afterwards); subsequent conversions are fast.

No uploadNo signupNo trackingFree, unlimited
Drop your Parquet file here
or click to choose a file

How to use

  1. Drop your Parquet file.
  2. DuckDB-Wasm parses it locally with read_parquet.
  3. Output is materialised as CSV in browser memory.
  4. Click Download.

FAQ

What about column types?

Schema is preserved: Parquet types map to their CSV equivalents. Numeric, string, boolean, timestamp, and nested types all carry over.

Does my data file upload to a server?

No. Conversion runs entirely in your browser using WebAssembly and Web APIs. Open the Network tab in DevTools while you convert — you'll see no outbound traffic carrying your file.

Is this really free?

Yes. No signup, no quota, no upgrade tier. The conversion runs on your machine, so it costs us nothing to host.

Is there a file size limit?

Browser memory is the only ceiling. On a modern desktop browser, a few hundred megabytes works fine. Mobile devices have tighter limits.

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