CSV to Parquet converter

Convert CSV files to Apache Parquet in your browser. Choose a compression codec and download the result locally — files never leave the page.

How it works

Drop a .csv file onto the page; column types are inferred from the data, the rows are written to Apache Parquet, and the .parquet file is downloaded. No upload.

Type inference

Column types are detected from the values themselves — booleans, integers, doubles, timestamps, and strings are recognized automatically and written with matching Parquet types.

Compression options

Choose SNAPPY (the default — fast, balanced), UNCOMPRESSED, or GZIP (smaller files, slower) before converting.

Private by design

The CSV is parsed and the Parquet file is written on your machine — no server, no upload.