CSV to Parquet Converter

Upload .csv file
or drag and drop

How to convert CSV to Parquet online

  1. Click the upload area and choose a .csv file, or drag and drop it into the page.
  2. Wait for the tool to parse the CSV file. Review the first rows in the preview table.
  3. Click "Download Parquet" to save the converted file.

Privacy

All CSV to Parquet conversion happens locally in your browser. Your CSV file and generated Parquet are never uploaded to any server.

CSV to Parquet Conversion FAQ

Is my CSV file uploaded when converting to Parquet?

No. The CSV to Parquet converter runs entirely in your browser. Files are parsed and converted locally with DuckDB-WASM and never sent to any server.

How large can a CSV file be?

You can convert reasonably large CSV files, but extremely large datasets are limited by your browser's memory. For multi-gigabyte files, it is safer to use desktop tools or CLI.

What compression is used?

The output Parquet file typically uses Snappy or ZSTD compression by default, depending on the DuckDB-WASM configuration.