JSON to Parquet converter

Convert JSON or NDJSON files to Apache Parquet in your browser. Choose a compression codec and download the result locally.

How it works

Drop a JSON array or an NDJSON (newline-delimited JSON) file; types are inferred from the data and the rows are written to Apache Parquet for download. No upload.

Compression options

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

Private by design

Parsing and Parquet writing both happen inside the browser tab — nothing ever leaves your device.