Parquet to CSV Converter — Convert in Browser with SQL

Need to convert a Parquet file to CSV? PondPilot does it in your browser — and unlike simple converters, you can filter and transform the data with SQL before exporting.

More Than a Dumb Converter

Most Parquet-to-CSV tools do a blind conversion: every row, every column. PondPilot lets you be selective:

-- Export only what you need
SELECT customer_id, order_date, total
FROM large_dataset.parquet
WHERE order_date >= '2024-01-01'
ORDER BY total DESC;

Export the query results as CSV. You get a clean, focused file instead of a massive dump.

How to Convert

  1. Open app.pondpilot.io
  2. Drop your Parquet file
  3. Write a query (or just SELECT * FROM file.parquet)
  4. Export results as CSV

Takes seconds. No Python environment, no pyarrow, no command line.

Handle Large Files

DuckDB WASM reads Parquet files efficiently — it only loads the columns and row groups needed for your query. Even large Parquet files convert quickly because DuckDB skips data you didn’t select.

Inspect Before Converting

Not sure what’s in the Parquet file? Check the schema first:

DESCRIBE SELECT * FROM mystery_file.parquet;

See column names and types, then decide what to include in your CSV export.

Privacy

Your Parquet file stays on your machine. The conversion happens in your browser via DuckDB WebAssembly. No server processes your data.

Why Parquet Needs a Smart Converter

Parquet files are columnar and compressed — great for storage and analytics, but unreadable without specialized tools. Most online converters require you to upload your file to a remote server, which is a non-starter for sensitive data. PondPilot handles the conversion entirely in your browser using DuckDB’s native Parquet reader, giving you full control over which columns and rows to include in the output. The result is a clean, focused CSV ready for sharing with colleagues who prefer spreadsheets.

Free and Unlimited

No file size limits (beyond browser memory), no conversion quotas, no accounts. Convert as many files as you need.

Try It

Open PondPilot and convert your Parquet files to CSV.

Back to home