Show HN: ParquetFormatter – Convert Parquet and Ndjson to CSV (and Back)

Hi HN, I built ParquetFormatter.com – a free tool to quickly convert Parquet and NDJSON files to CSV (and back).

The idea came from the pain of having a Parquet/NDJSON file and just wanting to peek inside without spinning up Spark, Pandas, or DuckDB. A lot of tools exist, but they either limit file sizes, require signups, or feel cluttered. I wanted something dead simple: drag a file in, hit convert, and download a CSV you can open in Excel.

The MVP supports: • Parquet → CSV • CSV → Parquet • NDJSON → CSV • CSV → NDJSON

No logins, no paywall, no fuss. Feedback is built into the app – I’d love to hear what adhoc operations you’d find useful on Parquet/NDJSON (filtering, sampling, schema inspection, etc.).

Curious if this scratches an itch for others in the data community. What’s the first thing you would do if dropped a Parquet file in here?

Comments URL: https://news.ycombinator.com/item?id=45458514

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